I remember when ios4 came out. A friend had an iphone 3g and he updated to ios4 on his phone. Apple stated that ios4 worked on the 3g but my friend told me that his phone got very slow. Its battery only lasted like 2 hours and it was overheating. I saw the video of the polish guy with ios5 beta on his 3gs but had anybody done the same thing and can tell me if there is a difference in speed from ios4 to ios5 on a 3gs?? will it work just fine?