I really like the sintered pads. Great modulation and power but not as touchy as the semi metallic pads. They can be a little noisy but not as bad as other brakes I have run in the past (cough....Codes....Cough). They last quite a while too. I got 15 days in the bike park and lots of riding on my home trails one a single set this summer. They don't stink when they get hot like the semi metallic do either.
I am in the 225lbs range and run the Sintered front and rear. I find the modulation excellent and the power plentiful. The T100 Sintered may require a bit more fine tuning to keep quiet but well worth it. I run another brands 220 Rotor, hoping Hayes comes out with their own 220 rotor and Post Mount.
Love the lever action, modulation, and power of the A4 Dominions!
Semi-met are great but don't last as long as sintered. Hard to choose between the two, I think I like semi-met better.
Second set of pads on my A4s. I got great life out of the first set. Love how quiet yet effective they are.