My spikeless spikes are Brooks Mach 8, but I wouldn't necessarily recommend them. They have a hard, stiff, angled outsole. Technically, they're a cross-country shoe. In other words, they're good for my purposes on the track, but I can't speak for them in any other application, especially one that's minimal/flat/barefoot.
Ah, pebbles… I have a few thoughts:
- If you have good barefoot form, you feel the pebble long before you put a LOT of weight on it, and your reflexes kick in and you recoil from them. So, jumping and twitching is a GOOD thing. It's what you're supposed to do.
- You get better at doing #1 over time
- As your feet relax, those things become less and less of a bother (your feet relax around them). So you find that you don't jump and twitch as often.
- With experience, you stop caring as much about small, temporary ouches ;-)
BTW, last Winter I decided to wear my Invisible Shoes until it simply felt to cold to. And the next thing I knew, it was Spring. See http://www.invisibleshoe.com/cold if you haven't already.