I think there's one Harbor Freight model in there. But the rest are Metabos -- a few different models, but only the German-made ones. They're stupid expensive if you buy them new, but I got all of mine second hand. One batch was in a box sold 'for parts,' and I didn't figure I'd get as many functioning models out of it as I did. So I probably have a couple more than I absolutely need. But like others have mentioned, it's a pain in the neck to change from grinding wheel to cutting wheel to flap disc to wire wheel when you're in the middle of something. My goal was to have four 4-1/2" models, two 6" ones and one 9" brute.
Up top, one of the bench grinders is still a Harbor Freight. It works, but I'm keeping an eye out for a good second-hand Baldor. Haven't found it yet.