I am curious as well. The Shreddage engine is highly optimized for guitars so it should be able to handle all the different techniques, unlike trying to shoehorn these into a generic player like Kontakt. I haven't tried any yet but would like to hear what other users say.
I know there's no serial when you buy from the VSL web page because the "product is already registered to your account." Nit sure what happens when you get it from Best Service.
I've found that to be true. They sound very nice here. Some of that is live and some OTS. It gets hard to tell which is which, but tremolos are all live. That is OTS' biggest weakness.
I wonder why their install process is so convoluted: open Kontakt, open Containing Folder, drag new files into the Sample folder.
Why bother going thru Kontakt? Just use Windows File Explorer.