And then Hayes mechanical disc brakes with the Di2 levers.
I've tried the new Hayes CX-5 (if that's what you're referring to) from a Norco CX bicycles at work, was impressed with the modulation which felt IMHO better than the Avid.
The pads haven't worn in yet due to it's being new but comparing it to my CX with Avid and decent levers, it's a noticable difference (levers were Tiagra with the Haye).
I've tried the new Hayes CX-5 (if that's what you're referring to) from a Norco CX bicycles at work, was impressed with the modulation which felt IMHO better than the Avid.
The pads haven't worn in yet due to it's being new but comparing it to my CX with Avid and decent levers, it's a noticable difference (levers were Tiagra with the Haye).