Re: quality 7 string electric guitar(s) you have played?
The Universe line of guitars have always been pretty good quality and the same goes for the 7620/1527.
The Ibanez 7 string acoustic was pretty darn good(sometimes regret selling mine). Sounded just as good as any $1000 Martin/Taylor.
ESP M7 (Japanese domestic model), pretty nice actually. Neck felt similar to my UV777bk. Just wished it had a reverse pointy headstock like my MII-Deluxe. Superb build quality.
7 string PRS - Ok, this HAD to be a custom one off. Essentially a Custom 24 with a 7th string. I guess the neck would be considered an EXTRA wide thin neck. Nice looking, but not worth burning a hole in my pocket book.
J-Custom JCRG-7vv/RG8527/RG8127 - Very nice guitars from Ibanez. About the same price as a Universe but with a better heel joint. Too bad it never came with an Ebony board with flame maple binding and a tree of life inlay.
ESP Stephen Carpenter 7 string model - Not bad since it's a neck through guitar, but why the hell is the neck pickup in the middle? Definitely not a guitar I'd buy because of the pickup placement.