First ride with clipless pedals today; it was a short 4 mile ride from one house to another. Definitely felt more efficient than those loose toe cages - the acceleration in particular is a lot better. There's less room for clumsiness, too, since I can sprint without my feet wobbling around on the pedals.
My biggest fear was that I would try to pull my feet out of the clips and just not be able to, but it's actually incredibly easy and intuitive to get your feet off with these SPDs - just twist your foot, which isn't too far off what I would do without them.
So far, I've not forgotten to unclip, though I did almost have a clipless moment getting off the bike when I unclipped the right as usual, but leant left to get to the kerb. Good thing these pedals let me unclip in either direction, because my instinct had me swivelling my left foot inwards and not outwards.
Got a 50 mile club ride to give them a blast on, but what I'm really looking forward to is the start of college term. That's when I'll truly get to test these beauties.