Well, I've heard the opposite...
This is what a few lbs have said:
The cleats do not imbed into MTB shoes, they need road shoes - unless you're willing to cut up the soles of MTB shoes which is not reccomended. They also require little rubber caps for walking & still will mess with your stepping normally.
Frogs are indeed "MTB" pedals and use recessed cleats just like Shimano SPD's, Time Atacs, etc. I've used them on road bikes for well over 60,000 miles and have them on three bikes right now. They are light, double sided, easy to enter and exit and have plenty of float. They do not need protective caps and walking in them is quite normal.
That said, while they are wonderful road pedals, they are not good MTB pedals. The cleats are prone to clog in loose conditions and won't let you clip in. I've had them jam with mud, ice and gravel so they are not really suited for heavy-duty off-road
use. The up-side is that they never refuse to release so you can't be trapped.
This message was edited by DaveB on 7-27-07 @ 7:41 PM