I've had an 8.5 since they got released and have had many good days on it and i think for myself it was a very good purchase. I weigh in at 90 kegs and use a 145L and a 50cm fin for this sail and get it to plane in 12 knots(with some pumping)but it seems to be more happy at about 15 knots. I get to sail on days when normally I would only see the formula guys out. I've had it out in winds upto about 20 knots and have been quite comfortable, above this the sail gets very heavy on the back hand. Overall the sail is very light and easy to handle and points upwind well, i did have to buy a 460 mast and a boom that goes out to 240cm but it was worth it. I live inland so i tend to sail in less than perfect condition and fresh water but it still performs very good, Where it came into its element was on a trip to WA. We stayed at Monkey Mia for 5 days and only got light winds between 12-15knots, i had this puppy out and flying every day i was there. Consistent wind is where the helium really shows what it can do. I've had it on a 120L and had no issues with it and can uphaul easily so i think the 130L will be perfect for this sail. But don't think your going to break any speed records with it as the helium is not a bullet, you will be out in 20 knots and some one on a 6.2 will run you down but for its intended purpose it is an awesome sail.
Have a look at this video of a 7.5 in action on a 118L with a light weight on board.
http://www.rikswindsurfing.com/news/2008/07-08/helium/bnp9v8h-vt-action.htmlIf you want to know more just let me know...Cheers.