Pros: + Love how silent it keeps my rig.
+Lots of room for fans and liquid cooling.
+KEEPS DUST OUT! I have a cat and this was the selling point along with the price I got it at. My last case was a mini atx case and it was a huge pain in the bottom to keep cool and clean. It was a fractal case and it had a dust filter in the front, but with cats... life uh, finds a way. (My last case was good for a starter case)
+Great upgrade if you are looking for a new case. Picked it up at french fries for 65$ after a little haggling.
+Did I mention it keeps dust out?
+My previous case allowed no real room for cable clean up, but I was lucky it didn't have a window. Now I am actually proud to show off my accomplishment in terms of cable management. The case has a lot of back room to hide those pesky cables from the PSU and the case itself. This also allows for great airflow which helps keeps the temps down.

Cons: - Not too happy with how installation went. Had A LOT of trouble installing the mobo with the screws I was given. They don't sit flush with the mobo which gives it wiggle room if you put pressure on it. The previous reviewer also had the same problem.
- Continuing with the mobo screws, it does sit tight and does not move or rattle when up and running, but it gives me some concern when transporting or even installing new parts or fans. Moving it on its side has not given me trouble yet though.
-One of my pros was how silent it is. IT IS QUIET, but not quite as quiet as I was hoping. The back fan which has no dampening around it is actually the loudest part of the entire case. Which I guess is to be expected, but still. It is MILES beyond what my last case did for me.

Other Thoughts: Just in case I was not clear about the installation process... IT WAS SLIGHTLY PAINFUL. Not too sure why it was so difficult, but like the other reviewer the screws would unscrew, but when you went to screw them back in it was almost like they weren't the same screw. Not a problem overall. I'm not going to be screwing and unscrewing things in more than once every 4 or 5 months when I get a new part or fan.

This case will serve well for likely the next couple years. Don't see why it would not unless I break something in it. If I do it will likely be because of trying to force a screw in.

Pros: +Ample water cooling support.
+Nice, modular design: 2 removable 5.25" ODD trays, replacement of HDD tray, can mount HDDs and/or SSDs on the back side (behind the motherboard)
+Good distance off the floor
+Plenty of space for 120mm, 140mm, and even 200mm fans, supporting 8, 7, and 3, respectively.
+Sound dampening material on top, front, and back side panel, with the top being able to be removed for added fan support.
+I'm not sure if this was even supported, but the back panel and window panel were interchangeable. So I can actually move the window panel and place it on the side with all my cable routing and put the sound dampening panel on the front. Helped with sound deadening.
+Dust filters for almost every opening: front, bottom fan placements and power supply, and even the top has a long magnetic dust filter; something missing from other silent cases. Only places that don't have dust filtering are the back vent holes and back 120/140mm fan port.

Cons: -With any case that's silent branded, temps rise due to the sound dampening material. Saw a jump in temps coming from my Phantom 530: idle went from 22-24C to 27-29C.
-Removal of top sound dampening pads completely eliminated my almost dead silent build before the panels were removed.

Other Thoughts: This was a good alternative to the highly popular Fractal Define line. It's missing a fan controller or hub that a lot of case manufacturers are including with their cases, but the fact that by default the F31 is all black, including the included fans, makes it a winner for me. No accent colors, except the HDD activity light (red) and power button (blue-purple-ish). Fractal does have their blackout versions, but they add a bump in the price.

Trying to add a 200mm fan at the front didn't work out as planned. I placed it on the front, after removing the front panel, but noticed after replaced the front panel and front fan filter, there was very little room for the fan to breath. Placing my hand where the air comes in I wasn't able to feel anything. Granted I was using NZXT's RF 200mm fan, so maybe it's thicker than Thermaltake's 200mm fan? instead I just added 2 140mm fans. Also, I didn't try placing the 200mm fan inside behind the mounting point. So it possibly may have fit that way.

I had no problems building in this case. It was pretty straight forward. The only concerns I really had, but didn't prevent me from completing my build exactly how I wanted it, was some of the screws may be cross threaded, so they were difficult to unscrew initially, especially the panel screws. I like that the screws stay with the panel, though. But along with the panel screws, the pre-applied motherboard stand-offs were also oddly pre-threaded. As I was trying to screw in my motherboard onto the case, the screws would stop just shy of touching the board, so the board would actually be able to freely move up and down whenever I'd put pressure down on it. The board will stay, but I have to be careful with transporting.

Some thoughts about the back panel HDD/SSD mounting: it was a bit confusing. The manual mainly showed just pictures, and the description was a little lacking. I was able to mount them correctly after a little fiddling, and the mounts are very sturdy. Only thing I wish Thermaltake would include were some straight SATA cables, and a couple of straight SATA power supply cables. I wouldn't mind an added price for those if it meant easier assembly. The way I have my 90 degree SATA power/data cables is very cringe-worthy, but should last the life of the build.

Overall, I'm very pleased with this case. Reason why I went for this case was I actually just built a mATX build in their Core V21 case and loved all the features and dust filtering on that little cube so I wanted to give their Suppressor series a try since a lot of the features for the Suppressor got me as excited as I was for the V21.