I bought an Do All Aerial Assault 3 about 3 years ago and I have been real happy with it. I got that one because it could be adjusted for the highest velocity. Only had to make one minor adjustment after about 800 birds. I also got the wireless remote so I can walk around and get any angle. Whatever you get, get an automatic float type batter minder and the battery will last 5 times as long. I have 4 Battery Tenders: on the GTO, lawnmower, target thrower, and motorcycle - but there are other brands too.
The commercial grade traps are better made, but more expensive and MUCH heavier.