I've had mine for 6 months now.. Love the bike, came off a couple of other 300's before getting one.
The bike rides great, the different maps really make a difference to the way it puts the power down, now things are getting wetter map 2 and 3 are getting used more and more. Power delivery is very smooth in them all but there's still plenty there when you give it more throttle.
I made up a jump lead for the battery so if I need to I can just pop open the fuel cover and connect an alkaline one without having to take off the airbox cover and remove the battery, but to be honest I tend to just throw it on charge for a hour or so the night before I want to go out if I've not used the bike for a couple of weeks and it starts fine.
Only thing I've done on mine is change the plug once and regular oil changes, (and a couple of levers and tyres as you would on any bike) everything still feels tight and precise on it particularly the rear linkage which on a lot of bikes develop slop pretty quick.
I've let a few other people ride it, who are better than me, if they've asked when I've been out, and they've all been impressed with the bike.
Also I think it looks the bolloks too and if you're going to have toys they may as well be good looking :-)
I'll be keeping this through next year, I don't feel the need to change which I have done on the last couple... unless I get a big bonus and I can afford the Ti version :-)