£11,000 is a lot of money, but in the context of instruments is pretty reasonable.

The original 1977 price was around £5800, which according to the BoE inflation calculator is £35,000 in modern money.

These are an unusual design, because they're an organ/synth hybrid. There's a tuneable oscillator for each pitch class, but they're divided down for the octaves. So it's more like a string synth/organ architecture than three full synth voices per key (which would be insanely expensive), but the dividers for each octave are driven by single VCOs which can be tuned manually and modulated together.

The sound is... interesting. Analog, but doesn't have the legendary reputation of other synths. Korg always made quirky little synths, and this is more of a quirky big synth. They didn't make many of the original.

The reissue is aimed at the usual Gen X/Boomer demographic who would have wanted one when they first appeared, couldn't afford one, but have the cash to burn now.