Bests & Worsts Reviews from Amazon

It's a very solid product. Installing it was fairly easy; they include a paper template so you can easily figure out where to drill the holes under the bottom of your desk. The tray height and tilt (both forward and back tilt) is controlled by one knob; you loosen the knob a little, reposition the tray, and then tighten the knob. Adjusting the tray angle can be a little tricky, but you won't have to do it often once you find an ideal position; from then on you'll just slide the tray in and out (if you slide it at all). Back-and-forth swiveling action is not adjustable, it's just pretty stiff, so the tray won't swivel unless you definitely intend to swivel it, which I think is good! The tray includes a gel wrist rest that extends across the entire front, as well as a "3M Precise Mousing Surface" piece of plastic that's about 6x7". Both are optional things you stick onto the tray, adhesive strips are included (though I used carpet tape to attach the wrist rest because it was thinner). I did stick on the mousing surface thing, but I am pretty sure I could have skipped it without missing it. My only minor complaint is that there is no ridge along the backside of the tray; if you tilt the tray away from you (which is ergonomically recommended), too much tilt could cause your mouse to slide off the back of tray (but on the other hand, if there had been a ridge along the back, the keyboard probably would have had to sit further towards the front of the tray which wouldn't be good either). The tray is 1/2" thick and made of some kind of very solid composite material. It's about 25.5" wide, and about 11.5" deep in the middle; it tapers so the front is slightly curved and the depth at either end is about 9". A couple of tips about where to mount it... First, the instructions say to position the template 1 5/8" from the front edge of your desk before you drill holes, but if you do that the drawer won't retract all the way under the desk - I positioned the template about 3.5" inches back, so the drawer retracts all the way; even with that extra space it can still be pulled out so that about 11" of it extends beyond the desktop, which is more than far enough to get at your keyboard and mouse. Second, the wider your keyboard, the further towards the left you'll have to sit compared to the center of the tray (assuming you are a righty and you use a mouse on the tray). To compensate for this, consider mounting the tray 3-4" to the right of center compared to the center of your monitor (or just move your monitor a few inches to the left). P.S. There are only two plastic parts; one is the adjustment knob (attached to a metal bar), the other is a stop you screw under the desk to prevent the tray from sliding all the way out of the track. I don't think this part would wear out unless you were always forcefully sliding the tray out all the way as far as it will go.