Can anyone comment on the ease-of-launch/stowage issue, or -
especially - on how effective their "UV stabilization" really is?

I used a WB 8 for a few years, both with a Cape Dory Typhoon and a Pearson 30.
Good little dink that tows very well, but has limited capacity. I can't imagine
launching it from deck without cursing someone out and I'm stronger than most
sailors.
Several people here have been talking about portaboats as a better alternative
to rigids and inflatables.
On my C&C 32 I now use a Quicksilver 300 airdeck.

Good luck,

RB