Actually the interface response and speed has much to improve and I foresee software updates to further optimize it. But for an UIQ interface, it is the fastest I have seen or used. The G900 will be good enough as of right now. If you have been using Symbian OS phones before, they're more or less the same. They don't have fancy transitions, S60 OS don't even have transitions. Only UIQ has it but very basic ones. I long for the day Symbian OS both S60 and UIQ can support Flash UI. It'll change everything. Just like it is changing WM which used to be a boring home screen and now to an advanced fancy UI.