Don't have a Vista and haven't met anyone with one.
I installed a Fisher-Paykel dishwasher, or "Dishdrawer" as they call it, and it works great. It uses less water than washing by hand. They are kind of pricey though. Ours fit in the space normally used for a propane oven/range combination, only we had the range and a cabinet. It uses 120 volt power, and hot water, as well as a discharge to your holding tank.
Again, the wife loves it. And, if she loves it, I love it.
Holiday Rambler Navigator DP, Hummer, and Honda VT1100C Shadow