i ride with double straps because i like riding in regular shoes as well.

in regards to macG's first comment, entering them is instinctive and fast, and once i've got the straps set for my feet, i don't have to tighten them down every time i ride, they just fit.

as for the saftey, i can't say. i know people who ride with fixed and clipless with no problems, but i've also pulled out of clipless pedals on my road bike. i don't want to pull out when i'm skidding to a stop in traffic.

i've never pulled out of a set of double straps.