My boyfriend bought this for me a month or so ago as an early birthday present. I haven't been able to use it as much as I would've liked but so far, I can't really complain. It is powerful enough to knead a tough bread dough. It worked great to shred some pork for puller pork sandwiches. 
I give it 4 stars because although some reviews said that I would be able to beat 2 egg whites with it, I haven't been able to. Neither was I able to whip 1/2 c of softened butter for buttercream frosting. In both cases I had to change my ingredients to a smaller bowl and use my hand mixer instead. That was a dissapointment. I haven't tried adjusting the bowl height to see if that fixes the problem as I haven't had enough time to play with it. I did try the dime test and my mixer passed it. I will keep trying though. 
For anyone considering buying this, I would definitely reccomend. It is a bit loud but not louder than a blender. [This review was collected as part of a promotion.]