Just switched to avid ultimates from shorty 4s. Bought front as "front" (came in box set up wide), rear as "rear" (came narrow). I had installed them very quickly (shop I was using a stand at was closing soon) so I mounted the front as it was, with the intent to switch it narrow later....
I absolutely love the ultimates, even with the front in wide stance. I wish I could say it was partially due to my aptitude as a wrench, but I put so little thought into setting them up, and they just worked flawlessly from the start. Great power, great modulation/feel. Braking on aluminum or carbon rims feels great, and I have no desire to swap the front to narrow. (Though I probably should to see if I prefer narrow more.)
I weigh ~165, and for racing CX they stop/slow me just fine. Front feels plenty powerful for anything I've encountered so far this season, rear feels good too. I can lock the rear up at will, but basically only if by choice. Further tweaking of the setup has been stupid easy, as well. I run sram levers, for reference.
A friend also just picked up a set of CX-9s, coming off of Spooky brakes (the brake guys, not frame guys. Google it if curious.) He has Campy on his CX bike. Chorus I think. Anyway. His gripe about the spookys was lack of power and finicky set up. In switching to CX-9s, he says they're way more powerful. (I've ridden his bike, can confirm.) But, the CX-9s, in his and my opinions, definitely don't modulate as well. More "on/off" feeling. He has stated that he'd like to play with them a little more to see if he can tweak things, but while adjustability is easier, there's also less to adjust. (He's looking to strike the optimal balance between pad clearance and lever throw to get better braking. But that's really all he can do to adjust...)
He is of the opinion that "when I want to stop, I want to STOP." But, I think they're too powerful for racing. Boils down to your preferences and needs for the bike. If you want more versatility, and better stopping power for all conditions (riding the bike on the road, or maybe some MTB trails), I'd go for mini-Vs. If the bike is going to be predominantly a race machine, I think ultimates are plenty.
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