I have about 5 months and 5000 miles on these. Paired them with Continental GP4000s tires.
Cost is just under 1K. Probably the best sub 1K all-carbon aero clincher.
Communication with Keith Williams is excellent. Came quickly and well packaged. Comes with QR skewers (I got some KCNC Ti ones from eBay for bling/light weight). Come with 2 sets (8 total) brake pads. Very easy to switch out brake pads, do NOT use your original/stock brake pads with carbon hoops!
Getting the tires on was a BEAR. I had to have my wife help hold the bead while I pried on with a plastic tire lever. Ended up snapping two tire levers but those were cheap Performance.
I am not 100% sold on the ceramic bearings but they run smooth.
The Aero benefits are most notable at speeds above say 23-25MPH. Very noticeable on fast descents.
The wheels are still as true as when they came.
Handle fine in crosswinds.
No Major complaints.
1. Tough to mount tires.
2. Braking is not as good as with alloy rims. This is true for all carbon hoops, though.
I chose 38mm depth because I am only 145 pounds and was concerned that deeper sections would not handle well in crosswinds.
If you have any questions, feel free to ask!
Doug a/k/a datlas