I have several of their 4.5" Paddle Switch angle grinders. I also have a Makita brand grinder and I think after some quick maintenance, the HF grinders are just as smooth. Before doing anything, I remove the 4 screws holding the output shaft pinion and put some good quality grease in there. Then assemble and use. I have one with paddle wheel, one with rigid wheel and another for whatever I might need. Saves a bunch of time and frustration. This model of Grinder actually has a rubberized coating and is ergro to fit your hand.