For information, the feet are adjustable and notched allowing easy adaptation of the length / depth to a larger computer (obviously until 17 ").
Once the MacBook Pro posed above (in my case a 13 "requiring no support size setting) I soon found that the temperature rises much more slowly than usual, I would check with time on different types uses and eventually would post if the finding is negative.
To give you an idea, my MacBook Pro is a 2012 version with a Core i7 (dual heart) that in "normal" use (surfing, email, Time Machine, sync files ...) in a room heated from 20 ° 22 ° is between 48 ° and 55 ° (for the CPU). Now, with the X-carrier temperature is 42/44 ° (always for the CPU). To download via Firefox, CPU temperature rose to 60 ° in seconds. With the X-holder, like a lot but it takes much more time. Once finished downloading the temperature drops too much faster than being directly on the desk (without foot ...).
Voila, sorry for the "novel" but I'm so surprised by the performance and the results obtained with this product (yet so trivial) I can only advise you to buy it; especially if you have a computer that heats much or simply to be more comfortable with the proposed tilt.