Porsche Convertible Sew-in window

Here's a link for all the Porsche Boxster owners who have a cracked
plasitc window to enjoy for the summer (I just joined the club). This
guy sells a do-it-yourself kit to replace the window and claims his
plastic is more durable and scratch resistant that OEM plastic.

http://www.emiata.com/BoxsterWindow.htm

Anyone ever tried this guy's kit? It's the only one I've found on the
internet and am skeptical about such a purchase....so if you've tried
this, pleas post and let me know if it's worth the trouble. Thanks!