Every phone I have tried at the stores Lags. I have not seen the blazing speed you talk about. My iPhone 4 works much better. Just me. I OS 5 messed up my phone and had to return to get a new one. It has iOS 4 and I will not be upgrading. I think this sight is not being truthful. The video if you watched closely was colors were in and out.
Buy what you want I am just telling you my experience.