I started another post some weeks ago regarding ADP.
Mostly, I heard positive things. Their aircraft are well-used. The feedback was that they fixed stuff if you were not happy.
I actually decided to pay a little extra and went to Rainbow Air at long beach. Good outfit, and have three brand new Cessna 182s with all the equipment you need. Run mostly by Brits.
If you want training try UK Flight training at long Beach. They do CAA/JAA ratings. i met students from there and all were happy.
Check
www.flyer.co.uk for details and URLs.
I would recommend California to hour build - lots to see.