I've had my cushtop for over a year now - and it solved my problem of my Dell XPS shutting down due to over heating, and burning my thigh beforehand.
Its not a cushion, but it is very comfortable for using your laptop for long periods of time. I rarely store anything in it as suggested because things are normally either to small and slide out or is too large and won't jam in!
Those who reviewed it as non-non-slip probably dont have rubber feet on their laptops - a flat plastic base will not grip on the material!
My Dell has 4 rubber feet and coupled with its large 9-cell battery has great grip on the cushtop - probably about 45 degrees before it slides.
I had a mate who laughed at it when I said what i'd bought. Then he used my laptop on it, and immediately ordered himself one!
Cant beat it for the function!