This may be a little late but I just got my 2010 Evo 8m. I weigh 160lbs (72kg or so). I ride at a down the line wave spot mostly side shore conditions with steady wind. I have had 3 sessions on the Evo 8m. The first strapless on a 5'5 fish in about 17knts. The second, strapped on a 5'8 Stretch quad in about 20 knots. The last again on the quad but in about 23 knots. Each session the waves were waist to head high. Have not touched the depower strap yet. I think 20-25 is the perfect zone for me for the 8.
Bottom line....this kite is MONEY! I had been riding 08 Rebels. The rebels feel lively and are quick turning. As is well documented, they can back stall when sheeting in. I have ridden them for 2 seasons so really know how to avoid the issues on those kites and have enjoyed them very much. But I must say, after 5 minutes on the Evo 8, I was sold. This kite is always where it is supposed to be. Flies fast, stable, will not drop out of the sky even under powered if you run underneath. Does not go upwind as high as rebel but definitely better than RPM as there are a lot of those at my spot. Bar pressure is perfect and power delivery is very linear, not on and off like a lot of delta kites.
I was concerned about the reputation of the kite being grunty. I hate a tractor puller. I did not expect that from the 8 but I did not expect it to be completely comfortable at my weight either. I can not drive the 8 to the window like I could my rebels, but just sheet out and all is good. I think in surf if you are a follow the kite rider with side or side on conditions, highly efficient kites like rebel do surge forward when you edge away from the kite to set up your bottom turn. This creates a longer distance for the kite to travel across the window to set up your next turn. With Evo, because it sits back in the window a bit further its easier to keep it where you want it.
I had not ridden the 08s or 09s but in at least the 8m size, North nailed it. I have a 6 and 10m on order. Post some feedback on those sizes if you have ridden them.