Have had my Galaxy S for about 10 days now but had to switch back to my Desire today as i couldnt take it anymore. These are the issues ive found. 1-Severe lag, sometimes even a few seconds. I heard all the hype about it being the most powerful phone but what good is it that if the software and hardware dont go together. 2. The phone will not automatically change back to 3g after being on the Wifi. I have to turn airplane mode on and off to get it to get back the 3g signal. (Have any of you found this also?) This is so so annoying. Hope these issues will be fixes soon with froyo or by a Samsung firmware update. 3. Battery life is not good. Maybe better than the Desire but still not good. 4. Unresponsive buttons. again connected with the lag. Seems Google and Samsung have some work to do .