I don't want this to be just another "hell yeah, the KPA is awesome! Blew my socks off!!" thread. I want to be a little bit specific if I may:
The amp sounds are f&^%ing stunning. I have it down to an ecstacy, two Legacy III profiles, and a triple rec. All of them sound EXACTLY like the tones I loved from those amps.
The delays and reverbs are also magnificent. It's hard not to just sit and tinker.
The harmonizer is so-so. Eventide takes an easy win here, but it's not "bad". It's just a little grainy for me.
The wah function. Holy jesus I may never plug my crybaby in again. I'm using the Bad Horsie settings and it's ridiculous awesome.
Direct recording sounds incredible, and with a decent PA and sound guy it sounds exactly the same direct to the PA live. (this was the #1 reason I got it)
Yes, there is a learning curve with it. Not so much learning HOW to do things, but rather WHAT it can do, then learning how. It's fairly intuitive when you know what it is you're trying to get it to do.
For me, in my own personal home studio, the SPDIF interface was not as pleasant as the analog output.
ToastME is like a third date experience. It lets you really sit down and get to know the KPA and not just twiddle knobs but you still have a lot of fun twiddling knobs.
It probably does a LOT more than I'm asking it to, but it's doing EXACTLY what I bought it to do.