Some people get on with them, but the Quartz pedals I had (some Cro-Mo ones and some Carbon-Ti) were the worst product I've ever tried, without exception.
They rely on shims between the cleat to get the tread of your shoe to provide stability. I never found a sensible comprimise, it was constantly either so tight you couldn't get your foot in easily, or so loose that it bounced out every time the bike hit a bump. I crashed at least twice because of sudden releases.
The Carbon-Ti ones I had seized solid after their second ride, I went to service them, and the body snapped. Luckily it gave me an excuse to send them back. Absolutely attrocious.