When my Universe got stolen I got a C7 blackjack and a computer with the insurance money. I still miss my universe but the C7 has better sustain and I like the 27" scale. I also found the Blaze pickups to not have much oomf and I really like the jb/jazz set that came with the blackjack.
The neck is large but has a comfortable curve for me.
I tried diamond 7 string few days ago and that neck was unbelievably thick. Why would they want to do such thing, 7 strings already have wider neck, you'd have to be a mutant or Steve Vai to be able to play on that