As far as the phone vs the Galaxy S II.
The Galaxy S II feels light for its size, and is very thin at 0.38 inches.
If you had said the Galaxy S Vibrant than I would agree but not this phone.
Call quality on the standard Galaxy S II is good, no problems to report.
I would see a major issue if something like this would happen to the Galaxy S II.
The hardware seems very similar to the Galaxy S and shares many of its specs.
I've been burned (not literally) by the battery of the Galaxy S 2.
But with the rumors of the next Galaxy S having a quad core processor I'm afraid this is only going to get worse.
The camera on the Galaxy S II takes good shots, even in low light.
No phone is perfect, but the Galaxy S II comes the closest we've seen.