I also, like others partially regret it. First, the battery life is almost below average, with heavy use, it cant go on for more than 6 hours, although standby mode battery life is good (But who needs that, if you have this phone, you wanna play, right!).
Second, LCD quality is inferior when compared to my previous phone, the Galaxy SL i9003. It also had SLCD but with great viewing angles and no distortion of text while scrolling.
Third, it doesn't support Video calls natively over UMTS network (Not data calls). Data charges are still high in my country and video calls are cheap comparatively. THis is a major let down for me personally. I stay away from home and use to call my family using video call from office. I cannot use wifi calls there as it is not allowed.
Other than these three, i am very much satisfied with my choice. Samsung is a bad company when it comes to supporting their products. I never have seen a service center or customer service response so pathetic. In fact, HTC customer care is quiet helping atleast in my country. Otherwise, I would have gone for Galaxy S2. I dont have issues with its build quality, but i cannot put my hard earned money in hands of a careless company with no customer focus.