Didn't do very well on my first run since I kept getting 21 and ruining the players' decent hands. Really fun game, some of the time I wanted to slap the players for standing so prematurely and forcing me to use special cards on them.
Could be interesting if you added some kind of "casino suspicion meter" that goes up when you use special cards and down when you use normal cards? I very rarely used normal cards towards the end because I liked having perfect control over what numbers the players were getting.