I've recently tried the CSS hack. In short, it is nasty.
Injecting the cheat is very simple. Open the loader, choose the CSS cheat, wait until it tells you to open the game, that's all there is to it. One you have it injected, the in-game menu is piss easy to customise to your liking.
The CSS cheat has a vast amount of features and they all function as expected. For the full list of features head over to the product page. I used pretty much all of the features outside of the hvh ones. I started off my using silent aim with auto shoot and dam was it beautiful. I was on one of the usual dust2 dm servers never missing a shot. The bunny hop works perfectly, just be careful what servers you use it on, some will auto kick if you bunny hop across the whole map. The ESP is very detailed and the colours are very easily customised. The cheat is sick for raging but just as good for closet cheating.
Even though the game is old, the cheat is still fully supported and there was even an update for it only a month ago. It's unlikely that any new features will be added (not as if you need any more) but the cheat will be kept functioning properly. There's also a private forum for anyone with the CSS where you can post bug reports, cheat suggestions etc.
As expected with PA the cheat is undetected and I don't see that changing considering it's a VAC protected game. Of course as there is no matchmaking, so you will be playing on community servers. If a server admin catches you they will ban you, but fear not, there's still a plethora of servers out there.
The cheat is perfect. The aimbot is super accurate, customisable and filthy. I honestly prefer cheating in CSS over CSGO at the moment. Considering the cheat is only 5.99 a month, it's a steal. If you play CSS on a regular basis it is a must have.
I may have a video of it in action soon, we will see how much time I have :)