Had it for 2 weeks and enjoyed 10 sessions on it.
This wing for me seems to be the 1 wing solution

In 10-12 knots just need a gust to get up with 5.2 foil freek. My 899 may get up a touch earlier but the 909 keeps flying in the lulls with a bit more speed.
12-15 knots with 4.8 foil freek is sweet, a few short pumps and I am up. Speed 20 knots plus is awesome considering 1 metre bay swell/chop.
15-20 knots with 4.0 freek I feel I can do as I please!
Control of pitch and speed enables gybes in confused swell to be predictable and deliberate.
20-30 knots with 3.3 freek with up to 2 metre short period swell control comes easily as it can be turned off easily or charge down swell at will with tips out on upwind and downwind carves

Will keep my 899 for just in case, sell the WO940 and keep my MP769 for longer period swell 25+ conditions.
Stab 395 with +2 shim regardless of conditions has been on the money!