I just got my KPA Powerhead last week and it is killer. The tone is great, the effects are lush, and the construction is solid. I certainly have nothing to complain about with this product.
However, I have noticed a few things that I think would make a good addition to the next firmware update:
1) Reverse Delay - I'm sure this has been requested by quite a few users but it bears repeating, especially with the prospect of combining it with the ducking feature.
2) Ducking Attack Speed - The ducking effect is super useful but it would be nice to have a little more control over how fast it kicks in without relying solely on playing dynamics.
3) Internal Effects Routing - I previously owned a Boss GT-10. It was an impressive pedalboard when it first came out. The internal routing options were incredible. You could apply pitch shifting or another effect to influence only the reverb or delay tail. You could just drag and drop pedals anywhere in your chain before or after the amp. If we were able to do this with the Kemper, the users requesting a "shimmer reverb" or a "crystal delay" could just make their own rigs.
Those are the only things I've noticed so far that are worth looking into.
Otherwise, I'm stoked about my KPA!