qblue, I'd love to play that "brick" ES-347...they are classy lookers for sure, and I think of them as something akin to LP Custom, so I expect them to have some mass.
My 1967 ES-335 is the lightest Gibson I've ever owned - around 7 1/2 pounds. It doesn't have quite the same sustain as most LPs do ('specially with that trapeze tail), but it sings as sweetly as I could ever want, and it can still growl mean enough for my needs. Best-sounding of the 10+ Gibbys I've ever had.