Right now I'm running your latest trial version and it mostly works great.
As a poster noted below, natural selection is the only half-life mod he plays. The same is for me. Currently the game runs perfectly except for one imperfection which makes being a commander in the game impossible. The interface is completely blacked out, the textures aren't being drawn.
This problem was solved with the 0.9.12 update for Wine on linux, but currently a fix isn't available for mac. Considering how old that version is of their software, I feel it would be a pretty easy fix for your guy's program.
Would really appreciate it if you guys could get around to looking into the problem.
Thanks :)