There's a big difference between the PSR-550 and the 2000 or 2100. There's no comparison at all. If you're a guitar player, you love what you can do with the 2000 with the guitar sounds--they're excellent.

Good Luck,

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)