I bought one of the lambskin cases for the n900. I got the black one.

My thoughts when I first opened the it was, Whoa! It's really thin. When the ad says 1mm, it really is 1mm. But it was buttery soft, very, very soft lambskin leather.

Then when I tried it on my phone, the fit was very snug. I had a hard time getting my n900 in and out of the case. But after a day or two, it loosened. Now, it fits perfectly. Although, I use a cellphone strap to pull out the phone from the case. Its hard to hold on to the n900 itself and pull it out of the case. And since I use that end to pull out the phone, I cannot use the headphone jack while the phone is in the case. However, I can still charge it though.

To sum it up, the good things I like about this case are:
1. Its thinness - it does not add the much bulk to the phone.
2. velvet lining - does not scratch the phone.
3. buttery soft leather
4. perfect fit (after a day or two of being used)

hope that helps