Don;t know what the difference is between the 5510 that we have and the 5520. The only negative I've found is that in thw winter it's hard to keep the hydraulic fluid warm enough so that when the tractor first starts hte hydraulic pump doesn;t squeel
We have a 6 year old 5520 that we use for all of our hay making, wet and dry. We are very happy with it, no problems so far. We keep it plugged in all winter, but I don't think that would be a big issue in SC.