After reading all the reviews, I must admit to being rather baffled! There seems to be such a split of opinion on these cases.
I do think many of the points made are fair:
1) This is a 'hard case', so despite having a soft 'satin' look and feel to the outside, the inside is rigid moulded plastic. When mine arrived, it was dusty inside, with a few bits of shaved plastic floating around from manufacture, and needed a good wipe around before I would put it on my Macbook. It's there to avoid scratches, not create them, so this is a little dissapointing, but perhaps it can only be expected; they're making a plastic case after all, it's not for use in an operating theatre.
2) The satin cover does attract some fingermarks, but it's not a huge problem. Just use your mac with clean hands if it distresses you! It just requires a wipe over once in a while, like anything that you want to stay clean.
3) There is a SPECK logo on the top cover. On the black satin model, it's very hard to see - you have to be looking for it, and it doesn't distress me at all. Manufacturers put their logo on stuff - it's branding.
4) The Apple Logo shines through the back, which is quite cool - it does look really smart actually.
5) It fits well. Some of the reviews state that a lack of clips on the bottom cover along the front edge make the case sag at the front. Well, it does, a little, but it is a rigid case, so we're only talking about a millimetre or two in the middle, and if it is sat on a desk or other rigid surface, them it isn't a problem. If it had little tabs along the front to prevent this, they would hurt your wrists when you were typing, wouldn't they?
6) There are vents on the bottom of the case, which just seem to have solid metal underneath on my Macbook. Perhaps they're located over the hard drive, or some other heat-generating area, I'm not sure. We usually leave ours on 24/7, and it doesn't get hot.
7) It isn't cheap. I bought a second-hand Macbook Pro, and this represents around 5% of the cost, but I hope it will sell for a premium of at least 5% over other scratched units if I ever sell it.
In summary, it looks great, does what it is supposed to, and I will be leaving one on my Macbook Pro, and replacing it if it breaks or wears out.