How does it compare to the Gibson Studio you had PhillQ?
It's a little hard to directly compare in a sense, because the Studio had a chambered body so it was acoustically louder and responded a bit differently. And the Gibson pickups are definitely a bit better than the Gotohs(?) in the Signature.
But if you're familiar with Gibson LP Studios in general, the Signature has a slimmer (but not really skinny) neck and (although it's not particularly noticeable in photos) a slightly modified body shape. Unlike the Gibson, the Signature has a proper long-tenon neck joint.
In terms of overall workmanship, I think the MIJ guitars win every time, they're pretty much flawless (although to be fair, there was nothing much wrong with that particular Gibson - everything was in the right place!). Compared with other MIJ brands, I'd rank the Signature (and Epi Japan) models with the better Tokais and definitely ahead of Edwards.