I have been using vac chaos with hacks and texture mod for over a month so far and no ban yet.
Since i use hacks i can easily spot other hackers and i would say that almost a third of people playing the game are hacking (around 4 every game) and sometimes more.
I am not taking this poll.... The VAC Chaos has been the main reason people are getting banned. I hacked since they have been out for the game and was fine, but when i got VAC Chaos I got banned in 2 days!!! This program is not good to use so you would be an idiot to use it.