Sandpaper....Norton A219 and A275 Difference?

[Earthling#44-9a]

Online Sandpaper guy was telling me that theirs now Norton A275 from Canada which is supposedly a much better paper then the ol Norton A219...it is however $0.79 a sheet (50 pack) compared to the A219 $0.58 a sheet (50 pack).
What makes it a better sheet and will it save me time and give me a better finish?
Or other their other random benefits such as guaranteed boost in sales? Or virgins falling from the sky?

[Earthling#44-9a]

One site says:

The Best Sandpaper on the Planet
A275 is sandpaper technology at its best. It cuts faster, runs cooler, resists loading better and lasts longer than any conventional sandpaper.



But is it only 10% better then A219...or 50% better?

[Earthling#44-9a]

Im surprised no one uses the A275 to comment..........