I bought a stainless Endura that I plan to have engraved so that I can give it to my brother as a wedding gift (need a separate gift for the bride, of course). He digs the stainless scales quite a bit.
I like the look of the stainless scales when new, but I'm not a fan of how heavy they are (particularly on a big knife like the Endura) and how easily they scratch. I don't notice scratching as much with FRN or G-10. Wood-handled knives can scratch too, but I think this gives them character. Overly scratched stainless just looks ratty to me.
I also have a good friend that loves them. He likes the durability of the scales, but I always argue that stainless is probably no more durable than FRN or G-10 versus most perils (unless you are talking about extreme heat, perhaps). I wonder if stainless is more prone to warping than FRN or G-10?
Engraving is definitely a plus for stainless. I've seen some really nice customized models, inlcuding the kiwis posted above.