I bought these after reading many reviews and owning some Metabo/Hitachi tools which fully met my expectations for Hitachi equipment. This grinder did not disappoint. I used it for about six hours and even with 60 grit it didn't even get hot. Dust collection is great, but I've used it outdoors in a light breeze, so I have no idea how well it will work indoors. I know the bag has been filled several times by sanding a large countertop down to bare wood. Changing the paper was easy to master, and the constant vacuum kept the paper from clogging with sanding residue. The only negative is that the list is not true. The scope of delivery includes two instead of five grinding wheels. Overall this is a very good grinder for the money.