I've used them front and rear since April. They are a bit finicky to set-up, but once the gap is adjusted they are good (except for the occasional re-centering of the rim between the pads). Both my training and racing wheels have narrow rims, so I don't have to adjust the gap.
I have them mounted on my P3, and they match great with the fork, but the rear, while better than a stock brake, it's not as seamless of a transition between the frame and caliper as the front.
As far as the stopping power, not quite as good as a Dura-Ace or SRAM, but very close. I never have a problem locking up the rear if required, and if you know how to brake, you can stop pretty quick. I have a part of my training route where I come down a hill, stop and turn-around. During that stop from about 35 mph, my distance to stop is about 15-20 feet longer with the Simkins than my old DA or SRAM Red. I never actually measured the distances, but the distance is probably about 65 feet with DA and about 80 feet with Simkins (based on visual cues along a driveway opening).
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