I have one on a bike with Campy 10-speed Ergo brifters, a Shimano long cage 105 rear derailleur and a Shimano 9-speed cassette. The bike shifts flawlessly all across the cassette with no compromises at either extreme.
The advantages to 9-speed cassettes is that they are available with larger ogs in MTB configurations. Shimano's 10-speed cassettes are limited to a 27T (or the new Dura Ace 28T) largest cog while MTB 9-speed cassettes are available with 32 or even 34T largest cogs. You will need a MTB rear derailleur to use them.