However, I had expected a little more. Namely a similar silicone case, as I had bought for my Galaxy S1 (i9000) on Amazon UK (www.amazon.co.uk/gp/product/B003VNPEGS/). The Case for S3 is slightly thinner than the the S1, which is not so bad.
However, the envelope is relatively hard and not very flexible, the phone can be a little harder to get out fumble. One should not start at the top you, otherwise you may open the back of the S3 with the same. Worried but I would make me more in terms of cushioning when falling down. The texture of old S1 Silicone Case, however, can be compared roughly with a silicone cake mold, so slightly thicker and very elastic (nevertheless remained Phone firmly in it), there's something more loss was inside.
The buttons for power and volume are exposed (but not protrude). There is therefore no silicone about this leaves the buttons, in my opinion, a bit too smoothly. When S1 they are specially coated with the silicone sleeve and are readily apparent, so you can press easily, but not too easy. Then When holding me passierts probably know that I'm right and left on the buttons, if I wanted to press only one of them.
Of course, that's partly a matter of taste, for me personally, but not ideal (but certainly better than no cover).
Conclusion: (just for this price), the envelope is sufficient and all the cables fit. Something more comfortable and slightly more protection as the S1 envelope would be desirable. Will continue to look out for something.
*** Update:
I could now see a soft silicone sleeve that comes the shell of the S1 (see above) extremely close. The only downside is that these softer S3 shell before going on by itself when you carry the phone in your pocket (S1 was in shell not as pronounced). That does not happen (the budge) in mumbi envelope.