About half my stash is now Flip - I am quite impressed with it. I held off for a long time because I figured "it's just a trifolded prefold in a Bummis, souped up". And in a way it is, but I like how trim it is, and although I don't find the covers especially exciting, they work well, and are gentle on DS' skin.
I am interested in trying the gDiapers cloth system though - I didn't realize that their cloth inserts were microfleece lined until yesterday. The gPants look pretty neat.
So no help, but I can give Flip a thumbs-up.