I tried it out, but didn't find it all that helpful. Maybe part of that is just getting used to it. I'm also worried about the long-term effects: I have a much better understanding of things if I write it myself. There's a kind of "practice" involved every time you write something (code, documentation, prose, music, anything) and I'm not so sure losing that is a good thing in the long run. Proof-read a thousand books probably won't make you a great author.