The main feature of the LG Optimus 2X is the dual core NVIDIA TEGRA 2 Processor running at 1GHz and the overall experience of the phone is indeed snappy. If a stock Android ROM instead, I am sure it will be even faster. I am not a fan of any manufacturer customizing their own Android UI. I just prefer the stock Android UI. Having said that, the LG Android UI do have some similarities with the Samsung TouchWhiz UI.