Hi Eric,
I've seen the new derlin Jvice and have had a quick play with it. It's a lot lighter than the original but it doesn't seem to effect the usability or quality at all, so I'd have no problem with it. From what I know about the material it should also last a lifetime. If I had the money I'd go for the original, but if you're worried about price I'd certainly buy the derlin version.
Regarding your second question, unfortunately I can't help you out here.
Good luck!
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