Only tried the nightbreaker in my old audi before the jazz, highly recommended and were going strong after more than a year. They have a very slight, and i mean very slight blue tinge(you cant see any blue its like they have a mist of blue over the bulb) which wears off after a few months.
But they were better than the manky halfords +40% things which were in.
Some reviews say they blow fast, but just send them back to osram and complain for a free refund
Anyway I suspect they will be better and im planning to get myself some for the jazz.