The positives:
+ Comfortable working height
+ Good workmanship
+ Non-slip (above and below)
+ The laptop can not slide down because "holders" are mounted forward
+ I like it better when I can set up my laptop at a 90 ° angle
+ Through the open design of the MacBook Pro overheats too quickly (air circulation)
+ I like the design and the open design
+ You can store the keyboard under the stand and has again more desktop space. (Also external hard drives make between the "legs" good)
Negative is:
- That can lower the transparent foot hurt slight scratches when you plug in the aluminum. This has happened to me; but would actually be only half a point deduction, because I think the stand otherwise great!
What else to note: I do not bewge the state, but if you want to push him around with a laptop, he can be unstable, but it does not break apart :-)