0-60 is not going to give much in the way of gains, maybe a couple of tenths faster on the mapped car (due to wheel spin cancelling out the extra power).
Top speed might gain by 5mph or so. In gear times would be better though thanks to the 60-80ft-lbs better torque.
Numbers dont mean as much as seeing it like in that clip above though.
Also bear in mind that a poor start can make all the difference
- Here are the same two cars again, but this time with my standard one beating the mapped one.....
http://www.youtube.com/watch?v=AU0Zw-pW26E&feature=related
As for asking if a remap is worth it or not - I have not read of one person on here who has gone for a remap regret it at all. Most will tell you its the best £500 they spent on the car.