Ok, I have done a little bit more research on this fuel.
Speaking to Martin Donnon today, it turns out this fuel CAN be a good thing. If tuned for this "boost 98" every car he's seen has picked up power in comparison to regular 98 octane fuel.
There is a catch however. He showed me some dyno graphs, and just by changing to this from another 98RON fuel, the car LEANED OUT BY A FULL AFR POINT (ie 12.5-13.5).
This would explain the increase in performance experienced by owners of cars with factory style rich tunes, but if your car is tuned on regular 98, and is "on the edge" I would steer clear, it could give you problems.
Joel, did you end up getting any? Do any logging of your car and the differences between fuels?