Comparison CJ MV-52 or MV-50 to MV-55?

I would appreciate hearing from anyone who has upgraded (or heard) the CJ MV-55 against eitger of the previous model amps. Thanks Dave
I havn't heard these other amps, I'm looking to buy a MV50 or MV52 also. Go to CJ's website. They display pictures and what has been upgraded on all of their vintage equipment.
Stereophile has compared these amps. You can go to their website and find the review.