My Rain Design m-stand is excellent, very happy with it too. A few years ago they brought out a new version with a little cut-out where you put your thumb in to open the lid, so if you see old pictures without that, most likely any one you purchase will be the new one anyway.
The Griffin Elevator looks very fragile, and the laptop looks like it could be easily knocked off... the mstand is very sturdy. The laptop is cushioned against the aluminium by thick rubber pads, so it doesn't slide around either. The keyboard is on an angle, which I much prefer to sitting horizontal... it's just for some reason feels easier to use.
AND it acts as a giant aluminium heatsink! If you can spare the $, it is highly recommended.