I have and use quite extensively Iris 1 - when 2 came out it seemed almost a retrograde step backwards, so saw no reason to upgrade. My Iris 1 still does everything I want, so I have still not upgraded - not sure I will.
But Iris 1 is great - as I said, no real experience in Iris 2 but if it comes with all the sound sets (I seemed to remember something about that) then if $125 that sounds a pretty good price - but beware, you have to have a specific use for Iris - it most certainly is niche market and not an everyday synth!
Cheers
Nigel