I have Massive X and a bunch of expansions I bought on sale last year. I have yet to really use it. Massive X was one of those things that enticed me to get Komplete a few years ago. I just have not been able to get into it at all. Who knows, maybe in 5 years time, Massive X will become as big as Massive and have a huge following. But so far, I get the feeling its a hard steep acceptance curve for a lot of people. I think the issue NI have with Massive X is, there is just a lot more very strong competition in that category than there was when they originally released the old Massive.
and once again, my theory that the magic number is about $100 and every company wants around $100 from you and are re-arranging offers and presenting them in such a way to get $100. 😉