Pros: - Work as advertised with RPC-2106 and RPC-4224.
- Only 1U, so if your server is 2U-4U, you have room for a cable management arm above the rails.

Cons: - Not long enough when extended. Leaves about 5" of the back end inside the rack. Not a deal breaker, but disappointing when I see my Dell R510 extend all the way. Bear in mind that the Dell rails are a lot more expensive.

- Can't be used with a cable management arm on the same level. Not a problem for me, my servers are 2U-4U and the rails being 1U, I always have at least a 1U space above the rails for the arm. This could still be a useful information to know for someone else.

Pros: Attached to rack without issue

Cons: Second time pulling out the server ever after it sitting racked for a few months and the entire right rail failed spilling ball bearings. Save your money do not buy!

Overall Review: Save your money do not buy!

Pros: it works with the Norco Case

Cons: Cheaply made, poor quality, cant hold the weight of my 3U norco NAS server
Arrived Late, and bent, I had to reform the ends so they would fit the rack due to being bent out of shape
Claims to be heavy Duty, I don't think it could support a light duty workload!

Pros: strong rails, feel like quality build
pre assembled, no screwing around to mount L brackets
entension locking

Cons: the silly "quick mount" system is incompatible with threaded rack. ( I missed this when ordering so while not norco's fault, it's a huge shame since the rails themselves are nice)

Overall Review: a little tight, so pushing the server into the rack is fairly stiff
just regular mount holes would have been nicer, or some way to switch out the quick mount for standard holes
I removed parts of the quick mount, which leaves a square hole I can put a threaded screw through, but the size is wrong so it doesnt sit quite right. need to either find a square space or drill out the dumb clips
the rails are nice enough that I might order more despite having to modify

Pros: These rails fit the NORCO 450 chassis I have and they don't need to be fastened to the rack they're installed in since they hook into the slots.

Cons: These are pretty sharp, though considering the quality of the case from them I half expected it. Be careful when handling!
The hooks have been over bent and need a little coaxing with a pair of needle nose pliers in order for the rails to slot into the rack.

Overall Review: One of the rails appears to have come with a little less grease, or the bearing sleeve has less tolerance since it's more difficult to slide.
The racks lock in the extended position if pulled out all the way and the tabs to release the rail need to be pulled to both remove the rails and in order to push the rails back in.
Did I mention these were sharp?

Pros: Works with Rosewill RSV-R4000 series cases
Full extension out of the rack

Cons: Came poorly packaged, damaged, rack ears bent
Needed to bend and adjust most of the tabs slightly to get it to fit properly, tolerances are a hair off.
Can only sit on exact 1U spacing, not inbetween a U due to the way the new snap system works
Super sharp.
Missing screws.
Uses non-standard rack screws

Overall Review: Wow did this thing fight me. It took over an hour to get this racked. The parts are all super sharp so wear gloves. It took me about 10 minutes to realize how the rails separated because the tabs are the identical color to everything else. After way too much research I found out this is the 3rd revision of these rails and that it would fit my Rosewill 4U case for which it has been impossible to find good rails for. You put your fingers in small holes in the rails when they are fully extended and "locked" to either remove them or push the rails back in. Once installed everything fit together perfectly and I had no trouble getting the case into the mounted rails or operating the releases. The lack of instructions, damaged rails, poor fit and finish, and missing screws did not make this easy.

Pros: Clips into the rack without requiring screws or cage nuts. Ball bearing slides are smooth. Locks at full extension, requires pulling a lever to retract or release slide from rail. Cheap.

Cons: Cheap. Quality control isn't great. On the first set I ordered, one of the retraction levers was broken, maybe folded inside the rail, completely jamming it. Got a replacement (thanks Newegg!) and this time both rails work, but on one of them the retraction lever was bent in a couple places. Not bad enough to make it unusable, but not encouraging. The hooks on the ends of the rail wouldn't fit over the holes in my APC rack, I had to bend them out a bit with a screwdriver to make them fit.

Overall Review: I bought this hoping that it would work for my Rosewill RSV-R4000 cases, but it does not, without some significant modification. The holes in the rail don't line up with the holes in the side of the case (easy enough to fix with a drill) but even after that, the rail interferes with the way that the handles and rack ears attach to the side of the case, preventing the case from sliding all the way back. The little parts of the rail that interfere could be cut off with an angle grinder or something without affecting the function of the rail, but that's more work than I want to put into it.

Pros: *Adjustable
*Well lubed
*Easy to install
*Very easy to pull the server out

Cons: *Took a while to figure out how to remove the part that screws onto the case (with the latch pressed forward just keep pulling it out)
*Required adjustment to fit in a standard rack
*Doesn't match the images on Norco site
*I would prefer screws as the locking mechanism is really hard to depress once the rail is installed, have to use a screw driver or you'll lose the tip of your finger.
*The latches that attach to the rack are very easy to bend.

Overall Review: Unfortunately, none of the install videos or images on the Norco site match this unit. At first, I thought it was the wrong item and almost sent it back. The lock mechanism too was initially too resistant to pull out completely.

But it does fit Norco RPC-270 case. Together they are one of the best combos for building your own system for ATX form factor I have been able to find in the past few years.