I have helped the local ABS rep breed many times over the last few years, and if you are set up right -yu can really move them thru there.
I like them -- sometimes it is a little tight working in one if you have too much equipment -- but with two guys breeding on both sides, it realy works for A-I
I have had some issues using them for ET due to the fact you can't fully contain them when you need them really still. If you are running cows that are used to the system, they stand pretty well, younger cattle that may be a little tight wound will move around alot in there -- but they doin chutes too.
If you have the means to get one, get the full blown top of the line deal -- hydraulic wheels and all. Spendy yes, but they will pay off in the long run in larger herds!
Good luck -- nice outfits!
Terry