So far it has been watertight; I had it done in June and wanted to make sure there were no issues before I posted anything.
Since then I've hand washed it several times, run it through an automatic car wash, and took it to one of the self service ones - I had about 10 -12 drops on the rear deck after that, but nothing else.
No fading, yellowing, etc. is evident, but I do keep it in the garage.
As for cost, that was the quoted price, probably because Buck had never done one before; he had to completely remove the top to sew the window in, and it was a lot cheaper than a new top.

Kevin