Xrumer 4 after update - what's the success rate?

I want to buy Xrumer .However I wanted to know firsthand from people's experience if it's worth it?Some ppl say if you read the documentation and learn to use it you will have success.Other say from 1000 forums Xrumer will post only to 100 and from 100 ... 75 will be deleted by admins...
I know a lot of ppl use it for doorway pages (and that i want to use it too ) but for the moment I want to know how good it is.
thanks

I run a forum that uses vbulletin and most of the automated post go into a moderated state. So a mod, or admin will see it and can delete or approve it.

So I am sure that most of the boards will have this same setting.

I run many phpBB forums, i used to get lot of Xrumer posts. Added recaptcha and spam posts is very low now. I don't think Xrumer will work properly now because lot of forums have spam prevention mods installed. It will work only for forums that are not maintained by anyone and full of spam.

thanks for input but I want to hear someone that use Xrumer