I have the GO V2 +, which I enjoy very much. I have asked myself how much of an improvement in sq (if any) I can get for this upgrade (which is actually more expensive, at $380, than what I originally paid for the V2 + itself during the crowd-funding campaign), and I cannot find any reason to justify the upgrade... (I only care about the SQ, not about the looks of the GO2pro or its value as a limited release signature edition... bla, bla, bla...)
I have to say that the rep of LH LABS for causing unexpected delivery delays is not helping me either to warm up to the upgrade idea (Hell, they promised a pouch/carrying case for the V2 +, which I have still not received, and no longer expect to receive)...
These are my thoughts so far...but YMMV, as usual... If you have anything related to add, I'd be happy to listen