nice info I'll sign up right away

lang-8.com is better to get corrections because it has "friends timeline post" so the more friends you have, the higher the chance you get corrections. I can say, friend features in here is useless because it wont make you get any corrections even with bunch of followers but I'm using the both lang-8 and italki.

don't say that because there's bunch of nice people here who will help you gladly :)