Gentlemen,
Most of my MTH Engines are P2, I do have a couple P3 Engines that work just fine. I do like the built in BCR type engineering of the P3, all my P2 engines have been upgraded with a BCR to eliminate the batteries. I do know there are some small problems with the P3, however I finally broke down and purchased the P3's, no problems yet.
PCRR/Dave