When the original Sting was put on the water it came with a longer Dart 15 mast, this was fine until you put the sail up. When we took this boat to Lake Como for a pre launch photo shoot, I took the boat out for the first time and as soon as I sheeted in the mast went into an s-shape, to much power for that mast.
So a cut down Dart 18 section was used, which unfortunatley added some extra weight which resulted in not much extra performance, which was a shame as the boat sailed very well. As for the sail lasting for 10 years it seems pretty good to me.
When we launched the boat at the London Boat Show, which coincided with an excellent review from Yachts and Yachting and a front cover picture of it blasting on Lake Como (Picture only showing bottom third of the mast), we sold a lot very quickly, then the sales slowed down down significantly within 12 months.
It felt as though we had found a small niche, filled it and moved on.
The inverting issue of the Sting seemed to be alleviated when the mast sectioned was changed to the 18 section, righting although not easy was achievable by uncleating all the sheets and travellor, pointing the mast into the wind, not the bow, easing out of the water allowing it to drain and it would come up.
I would say it was more of an issue righting a 16 single handed than a Sting