I have an original Gibson SG Gothic. I bought it new years ago, and later installed EMG's to it.(81 and 85)
It has served me well, I have had no problems.
The neck is quite a thick bastard, but that's nothing new when it comes to Gibsons.
The stock strap buttons were useless, so I put Schaller Straplocks to it. But other than that, I have not modded it.
It is an OK guitar I guess. In my opinion it is very reliable, but as a whole, a very average guitar.