How unstable is the OS X version? My card is a 

AMD Radeon HD 6770M 512 MB

You would think it would be easier to test for Mac, since there are only a few cards that you'll ever see. 

 

The last version I tried would crash after about 30 minutes without any real clear reason. Luckily, I was able to get a refund for it, but I would have much preferred to be able to use it.