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Ibanez Forum Nic
None. It was flawless. The store I purchased it from also set the 550 up for me free of charge. Everything is in perfect working order.
Vox Valvetronix AD50VT and the Electro-Harmonix Holy Grail.
Nothing. The 550 is perfect as is. I don't see the point of hot-rodding this guitar. It is a thing of beauty in its original state.
I love it and I am very proud (and lucky) to own one. The store I purchased mine at (West Bend White House of Music) gave my 550 a free set-up...now that is service. The RG550 plays like an absolute dream. I also received a copy of the "Ibanez: The Untold Story" book with the 550 as a free bonus, too. I do wish the pickups would have had the "V1", "S1", and "V2" markings on them, but that is only a minor quibble. It's a fantastic guitar nonetheless.