Don`t know much (as yet) about the X10.
I have an X1 which runs Windows mobile which is okay, but a few niggles.
The X10 looks the part but I`ve not had hands on yet.
A colleague at work has just got the latest HTC Desire.
Wow! Apple may well be looking over their shoulders with this one.
A lovely phone, runs on Android, and its lightening fast on web browser etc.