My experience with FSE Wheels is as follows and it has not been a good one.
I originally learned about FSE wheels from youtube videos posted by former pro racer Norm Alvis. Alvis is one of their Brand Ambassadors. The company claims that these wheels use a new carbon filament winding process that makes the wheels lighter, stronger and stiffer than other carbon wheels. I purchased these wheels based on these claims and testimonial of Norm Alvis. After ordering some wheels I was informed that it would take over a month to receive them and as a courtesy Norm Alvis lent me a set of FSE clincher 69s for use in the interim.
I used the 69s in my Cervelo S5 for a couple races and training rides and then took them with me to Masters Nationals in Georgia. The rear wheel 69 blew out at the rim track during the road race (photos attached). I informed Dan Kellerby at FSE of the rim failure and he was very apologetic and they were sent back to him. Be aware that I never used the FSE 69s on a mountain ride and the course in Augusta was moderately hilly. I was told at the time that the 69s were "prototypes" and therefore not a fully tested set but that not to worry the new FSE tubeless wheels would not be a concern.
I purchased a set of 45/55 tubeless clinchers and 79//79 tubeless clinchers - no holes. I have used tubeless tires for many years and I have never found them easy to install. I mounted Schwalbe Pro One 25s on these rims. I found it extremely difficult to get the tires mounted but after much struggle and aid of a compressor I was able to seat the tires. I used the 79s for flatter rides and the 45/55s for overall days but rarely on steep climbing days (I live in Colorado).
The rear 55 clincher rim that I purchased also had a failure at the rim braking track (photos attached). I informed Dan Kellerby at FSE of this issue and assumed I would be covered under warranty as these wheels are not even six months old - that is not the case. Dan and FSE are now claiming that the wheels are failing because of "improper braking". I have never heard the phrase used before and not sure what in fact "improper braking" is but I am confident that the wheel failure has nothing to do with that. I have raced for years on Zipp Carbon Firecrest wheels, 808s, 404s and 202s. I have many more miles on the Zipp wheels and never had any rim failures or braking issues. I have used my Zipp 202s for many, many races and training rides with long descents in summer conditions - NO ISSUES WHAT SO EVER! If I was riding brakes, I would never have a race result, and the Zipp's would have failed long ago. I have had these FSE 55s for less than six months and they have been used sparingly as I have been using my 202s for most climbs. The FSE 55 rear rim failed after just a few mountain rides. The pads used on my bike were the carbon specific pads supplied by FSE for these wheels.
FSE is not standing behind their product and trying to shift blame for failure. I question the quality control and manufacturing standards of their product. If the failure had been more dramatic during a high speed descent the consequences could have been severe. After my experience and their refusal to warranty the product I would warn anyone against buying these wheels.
Link to pictureshttp://aataxhelp.com/2017/11/fse-rim-failure/