The Good: The hifi is super stiff, extremely durable,and looks super nice, while maintaining a fairly light weight!
The Bad: A bit expensive.
Very nice stem! The quality and attention to detail is very obvious even at first glance. Very clean and sleek looking stem, the design is amazing! The hifi also performs great. I use the 50mm model for dirt jumping with 750mm bars and it has no flex. Big hardware and built very strong so it stands up to all sorts of abuse! Some say its heavy, but for a jump/dh stem it has a very respectable weight, doesn't feel at all heavy while riding. Overall, if you're looking for a great looking and performing stem in a variety of lengths look no further!