I went to ATA a nearly two years ago....
Overall i would say they were good. Teachers are good. PQ had a good style and technique and PL the same. ST knew everything you needed to know with a comittment to getting you through. A good informal atmosphere made the whole JAR thing a bit easier to swallow!
Tech's were a bit rusty but that can be sorted with a bit of feedback
They got me through so i cant complain!
I also did a short brush up with Oxford........I would recomend you look at them too!!