Well, I think I can safely say the Pacific Action sail works perfectly. I've had two proper sailing trips, one of which had some serious wind, the other was just a leisurely cruise. I hit Narrabeen lakes on Friday 4th August. The weather was crap, with plenty of rain and wind, and it was cold even by Irish standards. Downwind the Pacific Action sail managed about 9 kmh according to the GPS, and I could get about 4.5 - 5.0 kmh on a reach. Yesterday, I went outside the heads for the first time. After launching in Clontarf, I headed around (I think) Grotto point and paddled across the harbour and out through the heads. Couldn't find much structure, so came back in to South Head and had some fun with small snapper. Just as I thought it was time to head back in, I noticed the wind had changed to onshore, and I popped up the sail and had a leisurely sail home. Glorious way to spend an afternoon, and even with the sail furled, it doesn't get in the way, although, I am a little worried about getting caught in control lines should I capsize. Thats whey there's a shiny new dive knife hanging off my PFD. The rudder is a must by the way, no point in even trying to sail without it unless you're headed straight downwind. Hope this helps for those of you that are thinking about sailing.
P.S. I got it, and some other things from Blue Earth Kayaks in Drummoyne. Julie was telling me she was talking with KFDU to get their opinion on what Kayak Fishermen wanted her to stock. I told her I'd ask you guys too. If you haven't visited, I really recommend them. I'm not at all affiliated with them, just love excellent customer service, which is what they've given me every time.
See you on the water,
Robbie