I had great success with my Maxamps packs that I have had. They worked very well. Only reason I went to another lipo at the time was no ROAR legal hardcased option.
I now run enerland based packs and TrueRC lipos, and I am very happy with them as well.
I like Austin from the times I talked with him, and I had a good opinion of Jason from the time I met him personally till this:
http://www.nitrokillers.com/showthread.php?t=1552