I used it to buy a Jeep and tried to sell my Chevelle on it. They wanted the reserve to be at 35k and I wanted 55k, so they didn't let me put it on there. The funny thing is that a dealer bought the car from me and sold it on BAT for 85k and originally had the reserve set at 100k. YES, that dealer sells quite a few cars on BAT.
So, if you are going to sell it with a reserve, they may not allow you to set the reserve where you think it should be.
That being said, everything went well when I bought the Jeep and there weren't any issues whatsoever. I haven't heard any real complaints about it.
Just my .02....grr