I have a Dremel 4300. It is just OK. As Rustinmotion noted, if you had to remove 20 rusted nuts it would be stinking hot by the time you finished. The 4300 is convenient to use because it is relatively small and light weight. Unfortunately, because of its small size the vent holes are right where your hand holds the tool so cooling air flow is partially blocked. Also, if you are doing things like cutting rusty bolts you are using an abrasive disk and those do not work well at high speed. I typically run the tool at 10-15 on the 0-35 speed range. The lower motor speed also means reduced cooling air flow.
If you are regularly doing a lot of heavy metal cutting I would be looking for something heavier duty than any Dremel. OK for occasionally cutting a rusty bolt or sharpening the blade on your lawnmower.
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