Used to own a grey face 2600 when they were going cheap in the early 90's. It was a flexible and interesting synth but I didn't use it that much, preferring the Mini Moog, Prophet V and OB-Xa. After saying that I also had an Odyssey that also didn't get much use so maybe it was the ARP sound that I didn't like at the time.
Tastes change and now the ARP sound appeals to me. Korg have done a superb job on this, but I have already seen articles by the cork sniffing brigade saying how it isn't the same as the original. What nonsense. Just play the instrument and enjoy it.
Although, being a hyped instrument, similar to the CS-80 hype, it will be interesting to see how many people buy it and then think 'is that it?', surprised that it hasn't got supernatural audio powers.
Think this is one that is going to end up in the collectors vaults more that working musicians, although if I had the cash my name would be on the waiting list.