I've ran BFG drag radials on my OEM 'pony' wheels for about the last 2-3 years. They definitely will wear out quick (like in 5000 miles or so). Depends how you drive, etc. I was caught in the rain one time with them and it was scary - of course it was a complete downpour.
I liked my BFG's so much, that I just bought another set for my new Bogart wheels. 275/50/R15's. It's amazing how sticky these new BFGs are compared to my old ones.
Hope this helps,
E