I just returned my 5100 to Costco. I've had it a few years and had sent it to the factory twice as it overheated and shut down about half the time I would try to make anything thicker than your average soup. I mostly used it for fruit/veggie drinks and would put half room temp and half frozen items in it, mixing as I added each item. Having it overheat half of the time became VERY irritating and sending it in for repair did NOTHING! It doesn't look like there are any mechanical improvements to the 5200 so I'm at a loss as to what to replace it with. I like the new handle on the 5200 but not willing to deal with the same cheap motor.. For the price of this thing, it should NOT overheat so often! Imagine if you actually tried to make icecream or something thicker than the drinks I make!! If the pro has more horse power that might be the answer, but if it has less speed settings or no variable, FORGET IT! I've seen the industrial versions on cruise ships and they reverse when the bogg down, why can't they put the reverse feature on all units to prevent the overheating and average the price out across the board.. They may be a good company and all, but when you build something that SHOULDN'T overheat and then expect to get top dollar for the consumer version, that doesn't make for a "good" company, that makes for a greedy company!