Hi Ian
I guess I have an interest in the micro for the same reasons everyone else is having, it's small, light, cheap, a new toy. You get some Korg sounds and styles to add to your existing keyboard and/or use instead of. I think the newness and novelty has touched the kid emotions in us.
I'm actually, wondering why I'm interested though, even with the above, as I had a PA60 in my home for 10 days free trial from a local music store. They where going to sell it to me for their cost which I could verify as I was in music retail for over 30 years. I had the Tyros at the time, try as I might I didn't like the PA60 by far compared to the Tyros. I really wanted to like it, but it just didn't cut the buck. Everyone else who I did an A/B comparision didn't care for it either.
So, why am I thinking about the micro now? Maybe because I already know it will "different" than the T4, and I'm not being as knit picky about it.
The only way I would use the micro or 50, or 500 is if I picked out 10 to 20 generic styles that would work for all my songs, as I certainly would not want to set up both a Korg and a T4.
I do have a hunch that after all the fuss is over, there are going to be a lot of used micros for sale or stuffed in the closet. Maybe I should just wait til I can get one for $200 as I don't expect they will hold much of a value, IMHO.