Anybody use this program for running Windows apps in Mac OS?

I downloaded the trial version of Crossover Mac for games, used it to install Portal and Half-Life 2 Episode Two from my Orange Box disc. I have an Intel Mac with Vista installed, but for obvious reasons, I prefer not to use Vista at all. I only really use Vista for games, and I don't play a lot of games on my computer. I'd much prefer to play games under Mac OS, so I thought Crossover would be the perfect solution. Portal runs a little laggy at times under Vista on my computer, and Episode Two runs way too laggy to even be playable.

After installing and running Portal, I was pleased to see it it ran perfectly with absolutely no lag at all, even with the graphics setting turned up. I played it for a good while until it froze and crashed, since then it always freezes up on the first load screen and crashes. I tried playing Episode Two, and the graphics were so garbled it was impossible to play.

Not sure why Portal worked so well before, then completely stopped working, I had really thought this would work great

So, anybody else used this program before with better luck than myself? From browsing around on the web, it seems like most people get this to work without too many problems.