Guy's I shoot cowboy. I like it very much, even more so since I have started IPSC. I only take IPSC seriously now, so I just play around with cowboy (actually shooting cowboy better now, learning a lot from IPSC that I would never learn from cowboy).
Funny things I have noticed are that IPSC guys think cowboy is not as safe as IPSC and cowboy guys think IPSC is not as safe as cowboy. I have to agree with the IPSC guys, but I think both are pretty safe (cowboy does have a RO training program).
Another thing that is really funny is the cowboy guys think IPSC is too expensive.