Recently bought a Mecnosud Spiral Mixer which is Italian and specifically for mixing dough. It has no other functions beyond making airy dough that isn't heated by the hook. After many long and hard thought sessions, I decided to buy one new. Best decision I have made outside of throwing out those plastic dough boxes and switching to sheet pans. The mixer is absolutely amazing. We load it water/yeast first, flour, then put oil on top. Our batches are full 50lb bag at 60+ % hydration. There was a concern that the mixer would not have enough power given it wasn't 3-phase but it has plowed through like the flour wasn't even there. It only has one speed which is absolutely fine and IT DOESN'T ADD HEAT TO THE DOUGH! It seemed too good to be actually true, but wasn't. The dough does not heat up from the hook's action. That's worth the price of admission alone.
Prior to this we had a globe planetary and a univex planetary. This machine weighs half of the Univex, is on wheels and is so easy to use it's ridiculous. Only negative is getting the bowl off the deck when full. It takes two people to lift because it doesn't have handles. Cutting it out is far easier on your back. Super solid construction and the bowl is bulletproof. It's fully understandable why people use Hobart's and the like- especially if you shred your own cheese and make sauce in it, but just like any other business I've been involved in, "its always been done this way" doesn't work for me. SOOO glad the bet paid off.
Here's a video of it in action: