Good to hear you've gone for the map - I'm desperate to get mine done, but with a baby due and a house move on the go, it isn't going to happen soon!
The vec is pretty rapid as standard, so I expect that extra slug of torque will give a brutal kick in the back! According to the folks on vxronline, with a map they're capable of 170+ at the top end too!
While I'm here, I can resist sticking a few pics of mine up - I've just got some extra load space!
In answer to some of the points about how it drives - Mine's far from the way that Clarkson would have you believe, but it's not as chuckable 182 either (just look at the size of it to see why!) - it grips very well though, and as long as you're not a muppet with the throttle is pretty good overall.