Skipper,
Can't comment on price comparison with chain link, but I believe the link is more expensive. I put in the PVC fencing nearly 3 years ago and it has held up reasonably well. There were covenants in the neighborhood and it was a good style for the home. I have been told that it raises the value of the home. It is very expensive and you really have to be careful weedeating -- I took some chunks out of mine earlyon. There has been some shifting of posts, even though I put concrete in the post holes. For my application, it has worked well. Count on more cost than wood, but the look is good. Here in Iowa (humid), have not noticed any problem with mold or discoloration -- we're hot in summer, cold in winter. Purchased mine at Lowe's and did much of the work. It is VERY expensive to have someone else install it. Let me know if you need more info from my experience.
Bill