On my Dahon, which is only used for commuting, I have replaced the OEM folding pedals with fixed MKS touring pedals. These are really nice because I have 11½ size feet. I have also used the Powergrips with these same pedals on other bikes, and they worked well with one caveat. If you wear a shoe above size 10 and also wear athletic shoes with thick soles, You will not fit into the standard Powergrips. Be sure to order the extended size.
On the Dahon I like the freedom of not having any clips, or straps. I just want to be able to fold the bike in half so I can use it on the BART trains. On all my road bikes, I use Shimano Ultegra SPD-SL cleats. The one possible advantage of having the powergrips on the Dahon is to allow you to pull through the bottom of the pedal stroke which should smooth out the pulsation I can feel over 18mph, which I think is due to the smaller 20-inch wheels. I do not feel that on any of my bikes with 700c wheels.
I also work part time in the REI Bike shop in Concord CA, and have ordered these pedals for customers.
David C.