I used to work on a research boat in the Gulf and we used the bejesus out of those grinders. We bought 3 of them just to try and after daily use (and abuse) 2 were still working! The one that died was run over by a forklift. I have had one of these in my garage for 2 years and it still runs like a scalded dog. As long as you are just using them every so often, the $50+ grinders are nice but not necessary.