I'm in the market for a good powerful mixer to mix up triple batches of dough at a time for my Sicilian pizza. I borrowed a neighbor's KA Pro 600 with dough hook and set about mixing up a batch using 10 cups of bread flour at 65% hydration. My experience:
1. The mixer really did throw flour everywhere, what a mess.
2. It got to within 2 minutes of finishing the kneading and then the thermal overload protection shut it off. I finished the kneading of the 5-1/2 lb dough ball by hand.
It definitely was struggling trying to knead this dough and I was expecting it to shut itself off at some point. So it looks right in line with all of the comments that I've read here and in other forums. I need something more powerful than a KA for sure.