L4D2

Are all features advertised on the sales page still working, does it require patchguard.
When was last detection?
If the l4d2 cheat gets banned will I get banned from other games eg csgo because of system modifications from aimware?

Are all features advertised on the sales page still working, does it require patchguard.

Yes, everything is working and based on your OS you need to disable Patchguard

When was last detection?

I don't think it has been detected, since the release , but I'm not sure

If the l4d2 cheat gets banned will I get banned from other games eg csgo because of system modifications from aimware?

Everything you need to not get banned is in the Instructions

All the features work as advertised as far as I can tell. Patchguard must be disabled if you're in Win 7 64-bit.
The L4D2 cheat was never detected from what I have been told some time ago by one of the coders/admins. I have it myself and been using it for about 3 months now (on 2 different accounts) and haven't had a single problem yet. Both account are completely clean, no VAC bans.

I think that if you get banned in L4D2 you will only be banned in L4D2 and not in any other game (ex. CS:GO). Steam is banning by game now, not by engine. I am still now 100% sure about this though, so you better wait for a better reply.

If this helped you in any way, then please consider giving me a bit of +rep. :p

Welcome, enjoy your stay.