This is my first pair of carbon wheels so I don't have much to compare them to other than my old Mavic Alloy wheelset that they replaced. My average pace has increase 2-3 mph on rides, which is probably more due to the aero rather than weight savings. Comfort has improved significantly since I'm running my tires 10 psi lower. Overall, these were definitely worth the price, especially with the lifetime warranty.
One thing to be aware of is that I had a lot of problems getting the tire bead to seat on the rim. I put Pirelli P-Zero TLRs on them, which where super-easy to get onto the rim without tire levers. However, I needed to resort to compressed air to blast the bead into place. This was not an issue at all with my hooked Mavic rims.
Installed on my Trek Emonda SL6 and it transformed the bike from something I was going to sell, to my new favorite. These are a game changing wheelset. I am genuinely faster on climbs with these. As a nice bonus, I am also much more confident on descents and higher speed cornering on these as well.
I got these wheels with their RT28 tires and it was simple to install. I like the feeling of the bike now that I can run them at lower pressure (in my case 55psi front and 58psi rear). They are super comfortable and have made me at least 1-1.5mph faster.
Upgraded from the stock DT Swiss R470db wheels on my Roubaix. Huge difference! Feel like I am flying up inclines.
Mounted them with 30c Schwalbe Pro One tires. Smoothest ride ever.