We had pennywize, great interface and works great. We had a few problems with some brute force hacking, so we heard good results from people using proxypass. We got it installed and switched it over, its the most basic interface and well gives you fuck all features and no control at all. it was just an apache white page saying what accounts had been blocked, no reasons or indepth stuff like pennywize gives us on what country ip's, usernames & all the other features. Our bandwidth went through the roof as it wasn't stopping like pennywize does and so we moved straight back to pennywize and are happy enough now
Just my experience with them, a lot seem to love them so all power to you