The_Decryptor, on 30 January 2013 - 05:23, said:
Yep, as part of the port to OS X/Linux they made the HD pack mandatory (breaking lots of stuff in the process)
CS 1.6 is also apparently using CS:CZ models now, Valve haven't handled it well (i.e. the models are applied wrong, it's hard for mods to override them and it breaks things)
Edit: The HD pack has been broken since it was originally released and Valve haven't made any attempts to fix it.
It seems to run fine for me, haven't had any major issues. I haven't had it crash, although I did jump down a hole and landed on top of one of the little creeper things that jump at you, and I was unable to get off him, I had to reload to an autosave, which only lost about 2 minutes of play time, but it was kind of weird. I've played the online multiplayer and haven't experienced any hiccups as of yet. Seems to be working good except for the one exception.
Edit: They're actively updating it too. Since I've installed it, every day I've started up Steam and when I go to play it there's an update to install. Just thought I'd post this since I just installed another one, they seem to be putting some real effort into making this a pleasant experience.