I do like my Dremel tools. The new "click fit" system is fabulous for their grinding discs.
I find the drum sander arbor disappointing. As soon as you generate any heat, it goes soft and the drums fly off.
I am often tempted by the "flap wheel" type sander, made up of grit coated strings. They look as though they should be useful, but I can't see them lasting long. They're very expensive and in my mind too dear to try for what could be 2 minutes of amazement, followed by utter disappointment. Has anybody tried them?