8 years old Original Hope Mini ( not Mono Mini). Sure I have to shim them to set pad clearance but they provide strong power with nice modulation and are dirt cheap to rebuild. I did run an 8" front rotor for a while, way to much power and went back to the 7".
I've tried Avid Jucy 5's ( with 185 mm rotors) on another rider's Moment and they just don't have any power, in fact Avid BB7 would be my choice over the Jucy 5's)
Also ridden Jucy 5s on a lighter weight EW Epi, with 6" rotors, not much power there.
Also XTR 6" rotors on a light weight EW Epi, nice brakes but I'd need a larger than 6" front rotor or a change to metalic pads to add power.
Have tried Magura Marta on a 29er SS, and those were very nice!
Tried Avid Elixer CRs on Giant Trance ( XL) with 180 or 185 front rotor, which was way to much power and not much modulation.
Ran Avid BB7 Mechanicals for years on various bikes, have ridden heavy dual suspension bikes recently using them, just can't beat the simplicity of those or the cost, they really are simple to setup,maintain and provide good power.