Hi , I have a Dremel that is about 20 years old , Flexitool , with the flexible cable drive , 220volt , 25,000 rpm Model 23201.
I have used it for countless jobs , grinding , polishing & with various cutters and even as a tool post grinder in my lathe & has never given a moments bother. I have found the flexible cable with the collet chuck on the end to be extremely useful in getting into smallish , odd places.
Don't know about modern model numbers , but this vintage job really suits me.
Regards , Flatboy.