I'm definitely loving mine. I use it tons more than I did any other phone and still go 1 to 2 days between charges.
I moved to 3 from Vodafone due to the mobile internet dead zones in Edinburgh. There are still signal black holes in roughly the same places with 3 but are much smaller. General throughput elsewhere is much better as well, not to mention getting a gig instead of 500MB for less a month (SIM only contract, I too bought my note outright after working out it was about £200 cheaper over 2 years that way).
Love the Note and also the following things to go with it:
Breffo Spiderpodium: The everything everywhere stand. I've been hanging my note off the seat in front on the bus to watch Fringe.
Cheap MHL: output the Note's awesome resolution to an HDMI telly
2x Client: The Note's screen means remoting into the office is far less annoying than before.
FDroid: Free Software Foundation's repository of Software.
Tricorder: Fully working Next Gen themed tricorder (from FDroid, not the market)
Angry Birds Space: Paid the 65p to ditch the ads and all the extra juice they use.