I like the Crumpler strap. I have always used Optech's on my DSLR and I did use it for a few days on my X-Pro1 too.
The Crumpler strap is very comfortable on the neck. If I was to nip pick, I would say that the spongy part is not super flexible in the sense that you if wrap the strap around your wrist, the spongy (black) part will try to spring back to a U-shape. However, canvas straps that will wrap easily around the wrist are not that comfortable on the neck.
Hope that answers all your questions.