I have two, and my impressions:
One is a Bosch corded, quick-change, variable speed, all the bells and whistles. When I was comparing all different ones, most people rated it very highly, at or possibly above the Fein. Works wonderfully, comfortable, air vents are in a place that is hard to block (killed a Dremel version this way, by my hand blocking the vent at the back). Quick change is a nice feature, as is the wheel on the back. Cord sits in an orbital style plug, so no risk of bending it when moving the tool around. The case is "meh", has a hard time fitting the cord comfortably and closing easily.
The other is a cheap HF unit. One of their $10 specials. Single speed, hex key blade change, the basics. This thing only comes out for the dirty jobs, and every time it reminds me why I have a nice one. However, it has earned a spot in my workshop simply for being there for grout removal, sanding and other uses where it will inhale a lot of dust, and I don't mind if I kill a $10 tool vs $200+. Had one die thru abuse, and bought another for the exact same reason.