Sorry if this has been discussed, but I didn't know these existed: http://cgi.ebay.com/G-L-Tribute-Series-SB-2-SB2-MIJ-3tone-sunburst-great_W0QQitemZ120198802853QQihZ002QQcategoryZ4713 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
I'm curious how the build quality compares to the Korean and USA models.

I don't know a lot about these, but you can get the skinny Jazz neck on the L2000 trib that they don't do on the Korean ones.

but I didn't know these existed
There are only few of them. Tributes were first produced in Japan for a short time and later the production went to Korea and afterwards to Indonesia.

Quality? G&L Quality I suspect. ;)

Japanese instrument quality tends to be very good if you want to make a broad generalization. That's why people GAS so much for MIJ Fenders and older Japanese knock off guitars. Sometimes they're even better than US models in the latter case.

I believe the Tribute line in Japan was made only for the Japanese market. The US Tribute line started in Korea, then eventually moved to Indonesia.