Well, you probably saw my first experience with clipless - but I haven't fallen since starting back! (Knock on wood!!!)

ny biker had great advice, especially about figuring how how you get off the bike already. I think what killed me was that I was trying to take everyone else's advice when I wasn't ready for it. Fortunately, you've been riding for a bit longer, and should hopefully have a better idea of how you ride than I did.

I'm not trying to do time trials, so this might not apply so much to you, but I'm using SPD's (MTB style) on my roadie. From what I understand, road shoes and pedals are lighter (I think?) than the SPD versions, so that might matter for a time trial. But when I get to the point of the century, I'll be putting the A-600's back on (right now I still have my baby step, training wheel, A-530's with a platform side and a clip-in side), which have a better pedal-to-shoe contact area than most SPD pedals, and more like a typical road pedal. So those can work, but for what you're trying to do, you may want the road versions.

Have fun with it!!