I looked at every articulating keyboard platform on the internet, and they were all either very expensive (up to $350+), or the mouse platforms looked quite small. Many of them were also very heavy because they are made entirely of steel (the track, the articulating mechanism and the platform). Though they are sturdy, I doubt many home users need something so major.
This platform is fully adjustable just like most of the really expensive ones. You can adjust height, tilt, angle and rotation (360 degrees). But the greatest feature is the fact that it converts to one of two sizes. You can elect to make it hold just the keyboard, or insert an additional piece to make room for mousing on the right. And the mousing area it provides is nice and big! You can see it in the photo.
Another great feature is the weight. Though the platform itself is made of reinforced plastic (nicely designed), there is a sturdy metal plate that screws to the back -- making it just as sturdy as a solid metal platform.
In my opinion, the price for this platform is also an incredible feature of this well made piece of equipment. Again, other types from fancy ergonomic sites can literally run in the hundreds, and the average is probably $125 or so from the basic office sites.
Though you can buy some decent articulating platforms from the large office stores chains, the ones I found were by Fellowes or their store brand. Unfortunately, they were all very heavy. In fact, I twisted my wrist pretty bad picking up the box with one hand at one store after misjudging how heavy the box would be (I have carpal tunnel problems). the two I looked at literally weighed like 15-20+ pounds.
Two final feature about this platform that are noteworthy are the length of the track and the centering. Another platform I purchased (The Kensington Smartfit), while also very good (and heavy), has a track that is about 21" long. Unfortunately, the desk I just built is only 20" deep. This platform, however is only about 17 or so inches long -- and fits on the underside of my desk very nicely. And in terms of the centering, this platform is one of the only ones I've been able to find that is completely centered on the track; Most every other platform is centered on the keyboard tray itself, and then the mouse platform is added onto the side. This means that the track will fall at about six or so inches to the right or left of the center once a mouse platform is attached. With this platform, everything feels a little more comfortable for me. The centering also made it easier to plan installation around when it came to centering the platform in the area I wanted it.
I know this is a ton of information about what appears to be a simple product, but I wish I'd been able to find some detailed reviews of platforms when I was shopping around. It became quite a process, and this platform definitely came out on top. The quality and features for the price can't be beat as far as I'm concerned.