The reason that I purchased this trimmer rather than the much, much cheaper iPower style bowl trimmers is, what appears to be, a very robust design and the large capacity.
Most of the trimmer is of metal construction including the gear box. The plastic covers are flat and can be easily replaced of broken.
The only down side that I have identified is the weight of this thing. It is fairly heavy due to all of the stainless steel. I would certainly repeat this purchase if I had it to do over again.