While they seem like they'd be OK, it would be prohibitively expensive to convert multiple bikes for cleat compatibility (or inconvenient to constantly have to swap them out). I guess one could keep a pair of shoes dedicated to those pedals, but that would also be inconvenient to deal with. The folding platforms most folders come with are probably preferable in the general case, but if they exist, SPD compatible ones would be nice. If they're the combination platform/SPD variety, that might be perfect.
-alan
-- Alan Hoyle - [email hidden] - http://www.alanhoyle.com/ "I don't want the world, I just want your half." -TMBG Get Horizontal, Play Ultimate.