After 2 years I am still happy with both grinders. However, the on-board filter of both is so worn that it no longer fits properly and a visible jet of dust escapes at the transition to the grinder. I don't really care, as I almost always connect a shop vacuum cleaner. Apparently this is the result of plastic wear when removing and replacing the filter. At first I could barely turn it on and off. Now it is very easy to put on and take off. Another problem with the filter is the difficulty in removing the cover. It's so tight that I broke one of the tabs trying to remove it. Since most reviews are very positive, I purchased this product despite two reviewers reporting vibration issues. It turned out to be the smoothest ROS I've ever used, and a lot quieter than my old Bosch ROS (which still works great after many hours of use). The included filter works very well and the vacuum cleaner that came with my shop leaves almost no dust. There is an error in the description that you should look out for before you buy. Click on 'More' and you will probably be taken to a description of ROS20 - the variable speed version. ROS10 is a single-duty, single-speed grinder.