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.
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.