Have a couple of rigs pointed to clevermining. Rejects are anywhere between 5-20%, but if the whole pool is affected then I wouldn't mind since it should even out. What I don't like is the supposed bitcoin per megahash rate listed at the top of the page since it only includes accepted shares & not your total mining power.
no idea how you have the patience to do so. i was on clevermining for maybe 2 hours, and ran the fuck away from there. rejects were so bad.