Can plane fom maybe 12 knots...but im not too good as estimating wind speed so not 100% sure on that.
What I'd say is that before this my biggest sail was 6.7 and I used to see people blasting around on larger gear whilst I was standing still. The first time I used the 8.0 it was very obvious that the 6.7 wouldn't have worked in the same conditions. The 8.0 takes off even with relatively small gusts, and a few times I've found myself catching up with people on smaller gear, even though I'm still relatively new, its a good ego booster

Somehow I've ended up with 4 sails..but really only use two at the moment...6.7 and 8.0. I reckon a 3 sail choice would have been simpler - small, medium, and large...but hey, who doesn't like buying shiney new sails

Should be out on narrabeen on Sat if the forceast stays good, welcome to try it out if ur around that area.
[Edit - forgot to mention, the naish 8.0 rigged on a 460..works well but the boom is at the top portion of the cutout, i'm guessing since it's supposed to be rigged on a 490. I'm only 5`9 so this is fine but if you were much over 6ft might not work. Anyone able to explain the physics of why this is? the overall length is the same, im just using a larger extension to make up the difference.]