We have PRECOURT standing rigging on the F27GS and like it very much.

I've recently installed PRECOURT standing rigging on the 18Sq and although only have one sail with it, it did very well also. The Fboat has had its rigging for a couple years now, and has been sailed in some pretty icky weather.

Initially the stuff will "stretch," although it's not really stretching, the fibres are aligning. Once that alignment is accomplished, it stretches no more for all intents and purposes.

I strongly suggest using PRECOURT's stuff, for he's been in the textile rigging biz for a few years now. www.precourt.ca

and no, I have no connection other than being pleased with the product.