The Good: They work well for their intended purpose, they come in many colors, they look cool, they come in different rises, they are wide, they provide a great place to put my grips, shifter and brake levers.
The Bad: They are not free, they suck at chopping down trees and while you may think otherwise they do not make for a good eating utensil.
I purchased these new for a FR bike build I did over the Winter. I also went with the Spank Spike 55mm stem. The bars are wide and I do club the occasional tree when riding very tight single track but this does not bother me, it's all part of the game right. I have also used these at my local DH park, I would buy them again.