Some of you might know from a recent thread of mine that I mentioned my wife and I purchasing a couple of folding bikes from Camping World called Adventurer. One of the bikes definitely has to go back. The rear derailleur is defective. The other bike seems to be OK. I'm thinking of getting a Dahon after I return the defective one to Camping World. Unfortunately I can't afford two of the Dahons, but at least one for now. Looking at some of the models, and bare in mind my funds are limited. I'm stretching things as it is. Three models ranging from low to high are: Eco C7, Speed D7, and the Mariner. Would there be a lot of difference quality wise between these three models? Cost wise I would like to go with the Eco C7 if possible, but if the quality between it and say the D7 is quite a bit, then I will go with the D7. The Mariner seems nice, but I'm having a hard time getting my head around an all silver bike. After all, looks does account for something. Your assistance would be greatly appreciated. OK, reason for Dahon . . . it's the only decent models in my area that are available. I like the Brompton, but my bank account doesn't. Also, I checked some of the used bikes and I have to say no. So many people don't look after what they have, and I'm a stickler there. Thanks folks.