Thanks everyone for the responses! We just returned from our first bareboat vacation on a power cat. I won't name the company, but it is one of the more reputable ones. We had problems even before we left the dock, and continued to have issues (including no AC) all the way up until the last full day of our charter! The worst day was when they asked us to cross from Anegada down to Leverick with a dead starboard/house battery....No starboard engine, no way to dump the tanks or even flush the toilets, and no chart plotter (thank goodness I had a backup).
The company did offer a discount for a future charter, but instead I bargained for a (much) smaller refund.
Having said all that...we still managed to make the best of it, but I'm not sure how I feel about another experience like that!