The big differences between the Metabo and a normal 4" grinder is the fact that the guard allows a 6" cut-off wheel. Also, you can flip the washer over and use the grinding wheels and flap discs. To use the cut off wheel on grinder you have to take the guard off, or use a 6" grinder which would be a beast.

I am in need of a shop press in the not too distant future, but will probably build that. Anything safety related, I will not use a cheapo tool. That's just asking for trouble. The nice thing about the table saw was that the arbor bearing was just a water pump bearing. I just ordered a replacement, had some threads cut into it and pressed the flange on the shaft and the bearing in the housing.