Yamaha is certainly a reputable brand. I still have my digital piano (a Clavinova). It's still in near mint condition after 10 years. I can't say much for the keyboard itself, but I know I'd recommend Yamaha any day.
Two years is nothing for a keyboard. Pianos seem to have more of an investment feel - something that you purchase because you can see yourself playing it 10 years from now - than guitars do in my opinion.
To quote a great man, "If it sounds good, it is good."
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Music Gear Review - Keyboard/MIDI and Songwriting Editor/Mod
"I don't like it, and I'm sorry I ever had anything to do with it." - Erwin Schrodinger, on Quantum Physics
Keys: Nord Stage 88, Nord Lead 2, Yamaha W7
Upton Bass Custom Upright, BSX Allegro EUB, '80s Peavey T-40, MIM Active Jazz Bass, Godin BG-5, Fender Bassman 100, `68 Fender Bassman 50 head, Gallien-Krueger Fusion 550, SWR (pre-Fender) Goliath III 4x10, Markbass 2x10 Traveler