The neck pickup on the X170 is just divine.
Check out this bit of weirdness on the X500T. Look at those routes. If I didn't know better I'd say that this guitar was built with humbucker routes and someone expanded them to fit the P90s. The label inside says X500T and I've only ever seen X500Ts with P90s, but that doesn't mean anything 'cause I've been wrong about that sort of stuff before. The route edges are really rough and not like any of the other Guilds of this caliber that I have owned.
Here is the pickup and route from my 2002 SF-III-P90 which is more along the lines of what I'd expect to see: