I have used them for 2 years, for racing, training and even on dirt roads. I generally think there is little love for Mavic on this forum, but based on their weight that would only make sense
1. The Exalith brake coating is amazing IMO, by far the best stopping brake surface of any wheel I have ever used. I have had a few situations with riders crashing in corners in front of me where I believe the increased brake power prevent me from going down. In 2 years I have had no issues with the coating either, no wear, and they look good as new.
2. They are one of the most durable race wheel I have used, due to the design. I do not think an all carbon rim can hold up as well, as I have watched guys break Zipp and ENVE rims on things like train track, while my Mavic wheels keep on roiling.
3. Personally they are fine in cross winds for me, but I would bet ENVE and Zipp would be better.
Outside of that the other posters have covered the pros and cons. I just wanted to chime in as a guy who has used them for 2 full years.