what is the level of ability? is there a mix from black belt bjj to people that have only been going a month? I really want to do one, maybe not yet, but just to have a go, even if I get beat in first bout.. just so I can see what level im at, because most of the people at my gym are pro fighters, or have been going there for years, and the blokes that have been going less than me, id expect to be a little better.. whats the comman thinking on these, are they a good testing ground? are they unfair, in the way I could come up against a black belt in my first outing? what we thinking?