Product aesthetically class and done, the iPhone 3GS fits well, do not worry about that.
However, you will need either nails slightly out the phone from the base to spend vibrate in ring mode, because once lowered the button becomes almost inaccessible, it's my main complaint in relation to this case. No problem with the handling to make against the other way. You should also remember that the sides are not covered by the cover, but nevertheless remain protected through the valve and the plastic base that create a kind of space, avoiding the sides are on the front line in case of fall. The farm cover well with the magnets, no problem. The fact that the cover includes a plastic base increases the overall thickness of the phone, something that was not as blatant with other covers that protected equally. Similarly, you will be forced to leave the cover open to charge your phone, while there are other covers provide a large enough hole for the cable end with the closed cover. Personally, it is a detail not very annoying.
In short, I will say that this is a good value, aesthetically fine, not blameless, but this cover fulfills its primary function!