I joined ABT about a month back, I'll answer what I can.
They try to keep the number on a pair down but I guess its really dependent on the size of the squad. When I went there were 3 to a pair and it was basically like chasing each other around the ball return. I would have preferred a couple more on my pair so I had a little time to breath and think between frames.
The conditions are definitely varying depending on what the house has available. You could end up with just a house shot or a sport shot or a PBA pattern I guess if the house has the capabilities. In my area ABT doesnt bring there own lane machine so they are at the mercy of the house.
Last one I bowled in had a very flat pattern with a lot of oil on the outside. the people who scored best played very straight.
I am bowling in one on the 3rd, I have to bowl 2 squads so I can get into the regional in mid june.
If you're going to go, you better find a way to score, I was +101 with handicap and missed the cut by 60 pins. yeah thats right 761 series was low qualifier on my squad. The upside is there are some really good bowlers out there to talk to, friendly, helpful and I can see making some real friends out of it.
I live in a pretty major area where bowling is pretty prevalent there's an ABT tourney almost every weekend and I dont have to drive more than 10 or 15 miles unless its to a regional tournament which I havent bowled in yet.
Its good experience, I highly recommend it.
A man who thinks he can and a man who thinks he can't are both right. Which one are you?