I'm tempted to try custom rom (especially the swapfile and apps to card appeal to me), but I just got my pulse to that sweet state when it's solid as my primary phone - fully customized, everything works with my O2 sim, I have locale scripts turning my bluetooths when I prep for work and turning off all the rubbish at night and everything works so well that I charged it last time on Saturday morning and after two and a half days of moderate use (four phone calls, three morning alarms, 10 sms', 2 hour journey with bluetooth on) I still have 80% charge..
I presume custom rom would wipe all that, right?