I've had TRP spykes on my commuter for 6 months and once setup only required minimal maintenance. I've not used Avids much so cant compare them properly but from my limited experience I'd go for spyre/spykes again as I like the idea of both "pistons" moving to make contact the rotor.
Yep, in theory they're better. As for maintenance they seem to require strip down and rebuild annually. Depends how much use they get I guess. Whereas I've seen BB7s that are ancient and severely neglected and still work ok.
I've had TRP spykes on my commuter for 6 months and once setup only required minimal maintenance. I've not used Avids much so cant compare them properly but from my limited experience I'd go for spyre/spykes again as I like the idea of both "pistons" moving to make contact the rotor.