The Good: Light, durable and quality product
The Bad: None as of yet
The Race Face Diabolus stem brings both style and performance into one package. The first thing I noticed was the styling of the stem as it is machined from 6061-T6 aluminium and looks really smooth and tidy. The next thing i noticed related to performance was simply how stiff this stem was, there was a fairly drastic difference between this stem and some of the others I have used in the past.
The edges are also rounded out nicely which I think has saved my knees in the past. Overall I am very happy with this stem, it looks amazing with loads of quality and performance. After years of use I have had no issues/problems.