SG's rock! :D
Had a couple break the headstock off, but only when in the post. Easy solution....detune the guitar when shipping.
You'd have to really tw*t the thing hard to cause a break at the body end, and I try not to treat my guitars like that.
I've never had a Gibson SG that was neck heavy, only an Epi version.
I love them cos they are more alive and resonant than an LP, and have a wirier, more violin-like tone.
EDIT: Avatar updated to reflect SG love. Sorry Ted!
(Still want a Byrdland though.)