KA 7 qt KSM799WH Commercial Stand Mixer Reviews

I'm considering buying the KitchenAid 7 qt KSM799WH Commercial Mixer but find very few reviews and a lot of comments confusing the mixer with another KA 7 qt.  This 7 qt commercial mixer is the only KA currently being built with a metel casing protecting the gears.  I've been using the Pro HD model and since I've been making bread and pizza dough have stripped the gears several times after cracking the plastic casing a year ago.  We're currently waiting for a new plastic casing to repair the Pro HD.