Nice Review! I've been having some good luck with the Staedtler brand erasers, which are moderatly priced, large and work great on thin paper, moderately no ghosting, Might have to check these babies out though, lol.
I'm hoping the Lumographs will provide that elusive Goldilocks state between the Wopex and the Norica. I don't like how the Wopex writes, but the Norica doesn't stay sharp even for a single logic game.
Got the sampler in the mail. I am really, really impressed with all the Mitsubishis. The Lumograph does indeed seem to be somewhere in between the Norica and the Wopex, but I gotta say, I think the Japanese pencils are superior.