Yeah I've hit the safety shutoff a few times when I was jammin a wire wheel around rusty sheet metal. I've heard that they're better about powering through if you have the 6.0 M12 batteries, but mostly I don't have a problem with it as I'm just deburring cut metal and cleaning up rusty problems in hard to reach places. I think Milwaukee probably erred too far on the side of caution with the safety shutoff on that tool in particular, but then again die grinders are
supposed to be about using speed, not power to do the job.
One thing I don't like about Milwaukee, and this isn't exclusive to them but it's annoying, is that there can be 2-4 different models of the same tool that are visually very similar, but the cheap ones are brushed tools with less features and they seem to sell the last generation models side by side with the newer ones. For that reason I typically try to get the FUEL brushless versions wherever possible, and I always have to research the model number to make sure I'm getting the latest Gen 3 or Gen 4 or whatever model and I'm not losing out on features or power because I didn't know better.
toolguyd.com is a great resource for catching the deals and staying up to date with new releases.
Also, for everybody with a drill and/or impact driver, do yourself a favor and pick up a brush and polish kit like this one:
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There's tons of different packs with various items similar to that on amazon, but that's the one I picked and I use the brushes all the time. The little polishing pads have also been great for working scratches out of paint or small detail areas that a normal car polisher can't fit in.