Pigleto, I think it's mostly the slouchiness, although I like slouchy bags (I have 2 Birkins in Clemence) but Swift is just too much for me... I think it would be better if it was lined in Chevre, like most other Birkins, rather than Swift, it would be just a tad less slouchy. Also I'm a bit dissapointed in the particular hue of brown that Swift comes in. It's Havanne, and has a slight reddish undertone in certain lights, that I'm not too fond of...Finally, although I love the feel and the smell of Swift, I find it looks a bit "spongy"....
This is why I'm interested in finding out about Evergrain, b/c I prefer smooth leathers to textured, but besides Box, which is my all time favourite, I would like a leather visually similar to Box, but softer.....