I have a 1991 RG550 and an '03 RG370DX. The RG550 blows it away as far as sound goes, although you can change pickups. The V1/S1/V2 pickups are nice. The tremelo isn't as stiff as the new ones (for fluttering, if you do that sort of thing) and I think the neck is a bit thinner. I bought the RG550 new in '91, sold it in '96, found it again (yes, same guitar - I recognized my dents...lol!) at a pawn shop last year, and it is just as solid now as the day I bought it. I agree with finstah on the tremelo. It rocks. I wouldn't change a thing. The only thing not original is the volume/tone knobs Had to lose those Strat-looking things!
Fortunately, guitars don't get jealous, so don't feel bad if you don't play your other one as much anymore. If that was the case, my Destroyer would never speak to me again! :P
If you choose the 550, you've chosen well
