[Paddlewise] Sail vs. paddle?

I've been starting to do some reading and research on folding kayaks.  I'm
interested in the fact that it is possible to sail in one, but I have a few
basic questions:

1)  How well do single-seaters sail compared to dual-seaters?
2)  Is it "fun" to sail a kayak, or a hassle, or difficult?
3)  How effective are the upwind sails vs. downwind only?
4)  When  all is said and done, are sails worth the cost?  If you have sails,
would you buy them again?  If you don't have sails, do you wish you did?
5)  How much total cost do upwind or downwind sails add, all things considered?

Thanks in advance for any insights.  I know a couple of people with kayaks, but
no one who sails in one.

jim

***************************************************************************
PaddleWise Paddling Mailing List
Submissions:     paddlewise_at_lists.intelenet.net
Subscriptions:   paddlewise-request_at_lists.intelenet.net
Website:         http://www.gasp-seakayak.net/paddlewise/
***************************************************************************