Pros: Very good design that fits perfectly on my hand. 3 year warranty.

Cons: Although design was good, build quality was poor. Comparable to $5 keyboard. Plastic covers have sharp and rough edges. Ball for track ball had a bump and does not roll smoothly. Keys required more pressure than usual keyboard. Right click button on top of track ball did not work unless I press it hard (bad switch?)

Overall Review: It would been a great keyboard if it was built with some quality. Returned after trying for few hours. Price tag is very high considering its build quality.

Pros: - Good working range - Trackball and buttons are located exactly where your arms expect them to be - Rare type of product that incorporates trackball, not the tuchpad

Cons: - Manufacturing quality: The trackball was trying to fall off, the keys were hard to puch, the edges are scratchy. Everything looks cheap. - The keyboard dropped RF module every hour, tech support said "try reconnecting, if it doesn't help, try reconnecting again", sometimes you have to press a key twice to make it work, which makes reliable typing and even point-click surfing very hard. - If you play games with keyboard you are in trouble. Continious pressing of any key makes keyboard think it is accidential keystroke and the key is "depressed". So for example pressing accelerator button in racing games is problematic. - The keyboard layout is confusing. No blind typing is possible, the keys are bit smaller than on strandard keyboards and dislocated so you will press wrong buttons. - Finally the keyboard broke after 2 weeks of usage so the trackball that was not working well before just stopped working at all. Currently I am waiting for refound and searing for better product

Overall Review: I've seen exactly the same kayboard on <well-known marketplace, starts with "e" :) > sold under different brand. You can make your own conclusions :)

Pros: Lightweight, exceptional battery life, exceptional ergonomic fit. Highly intuitive control layout for mouse functions -- better than any of the others.

Cons: Very low RF output -- I got the best connection when I plugged the USB receiver standing straight up (in a small usb dock) and is line-of-sight visible. Problem solved. No back-light. HTPC kbs should all have a back-light option (I know: it's not advertised as an HTPC kb. I know!) Occasional missed keys. Would be nice to be able to map my own keys. Trackball is reportedly not silky smooth out of the box, this is true, but if you want a decent KB for HTPC control, then not a real problem and it smooths out the longer you use it. If you are want a wireless KB to run Photoshop or type up your blog, I suggest you try another.

Overall Review: Several people report that this kb boots in numlock mode -- this is a windows problem, not your KB. It's also more than a little annoying and you can't fix it in the BIOS: search online for 'numlock on boot in windows registry' to fix it. I did, worked great. Jerky media volume control problem: this seems to be is a symptom of the WinLIRC command set and its interface in Windows Media Center. The media keys (vol). control the OS volume -- many programs have their own control on TOP of that. I gave up on WMC and went back to BSPlayer, and surprise, no more Vol control issues so the problem is not the kb alone. I would definitely buy this kb again and am thinking of picking up a spare in case I break it. Beware: it's branded under a dozen names, pick one from your most trusted website and look for the longest warranty. The SIIG here on NE has a 3 yr warranty; the same kb branded Adesso (also on NE) is 10$ more and 2 yrs less.

Pros: Ergonomic feel.

Cons: First keyboard came with the trackball DOA. took over two months for an RMA replacement. Second keyboard (the RMA replacement) lasted about a month before it's trackball quit working. Third (New) keyboard, the trackball half works, sometimes the optical lift works, sometimes it doesn't. Also the keys have to be pressed several times to register. Over priced Piece of junk. not even worth using if it's free.

Overall Review: Not sure how SIIG is still in business. I've gave them three tries, never again. I sent the last keyboard back to SIIG in pieces.

Pros: - compact size - ergonomic shape fits great when holding it - great button placement - built-in mouse functions (in theory) - wireless

Cons: - poor build quality in both units I bought - flimsy, loose trackball - each button must be pushed 3 times to get a response! - no backlighting

Overall Review: I bought 2 of these when they were on sale because the design is similar to another keyboard I had. There used to be an awesome, full-size version of this keyboard made by iMedia, but it's been discontinued. Too bad - I've yet to find the perfect replacement - this isn't it!

Pros: Small footprint, connects easily with good range. Function buttons well placed.

Cons: Terrible, horrible, trackball. Trackball quit working after three days.

Overall Review: Another similar keyboard by another Mfg was similar but slightly larger has three keys quit working, so seemes I need two keyboards to do what one should.

Pros: ergonomically well designed

Cons: Trackball is just no good. I had one of these keyboards, used it for about a year and it quit. Bought another to replace it and the build quality on the trackball was cheapened. It feels horrible when you try to use it. So, I returned it and got yet another replacement. The trackball worked well for about 1/2 hour and then started to feel very sloppy... so bad than it really can be of any good use. I will not buy this product any more - will switch brands.

Pros: The ergonomic design makes it very comfortable to hold for trackball function.

Cons: The RF range was abnormally poor. Without line of sight there was absolutely no connection and w/LOS the range was about 7-8 feet but was still spotty. The trackball felt like a toy-aisle dollar-store product. I just felt like I was going to put my thumb through the trackball at any given second. For the price asked, this is a very poor product.

Overall Review: I returned this product in favor of another. Anyone considering purchasing this would do well to look somewhere else.