I'm in the same boat as Steelscout. I just received mine in a trade and the other person is still awaiting his end of the trade so I haven't gotten to do much but handle it, but I'm impressed. My large folder of choice for a long time was my G10 Cara Cara, but this knife packs a longer blade with better geometry (Edge needs thinned out a bit though), longer and more secure handle and still manages to be noticably lighter. Most won't care, but it carries clipless much better too. The heavier Cara Cara sank to the bottom of my pocket and layed itself horizontally, while the Millie spends most of it's time upright like when you have it clipped, due to the size and lightness of it. Very comfortable knife. The Manix is an awsome knife too, but it wouldn't get carried by me as much if I still had one because it's nearly twice as heavy and much wider.
I'm a big fan of G10 Spydies with no steel liners or nested liners, like on the original Millie, Yojimbo, Dodo etc. I want to get more of them. I'd love a Lil Temp and I'm actually re-considering the Para, which I traded off due to awkward ergos. I'd like to see Spyderco produce more models with this type of construction.