I use eggbeater SL and C on my personal bikes, and most of our work bikes have spd. I feel completely confident in the eggbeaters. Been using them for just over a year, haven't unintentionally pulled out yet, and I click in and out well over a hundred times per day. I ride a front brake, though, and rarely skid or skip. If I was a serious skidder, I'd probably actually go clips and double straps...