Wow, it just arrived. Unbelievable fast, I thought I would be very lucky if I get it next Friday.
My first thoughts are very positive: It fits perfect and feeld high quality.
The Flip gives a good protection, it's very strong. The battery cover is a bit thicker than the original one, so it protects the camera lense but doesn't make the phone bulky.
Two little disadvantages: It smells quite bad, but I believe in a week the stink is gone. And the back is very smooth, even a bit slippery. The plastic texture of the original had more grip, but it the aluminium looks simply great. So that's ok.
I'm very happy with it!