Cool!
"Green fingers" 
You won't be truly blues, though, until you:
a) Get a neck (usable for slide) off of a wine bottle without bleeding to death
or
b) Use a knife to play slide (preferably sat on the porch)
I have yet to achieve either, although I did have a good crack at a) a few years ago (I gave up and bought one!)
The RockSlide does ring a bit more, but the copper pipe feels nicer as it doesn't have layers of gaffa tape inside. Overall, I'd say I like them both equally.
By the way, I liked the sounds of the porcelain Joe Perry slide alot, but it was bigger than stated (17mm vs 16mm) and I didn't like the feel of the huge wall width that much.
So I guess I am, reluctantly, a metal slide kinda guy since they can be made a bit less thick. I do prefer the glass and ceramic tone though.
