How about a tuner that doesn't take a couple of seconds to settle? Absolutely useless for live playing when you've only got a couple of measures to check tuning. If you look at Michael Britt's boards, he has an external tuner. I use the Polytune as the LEDs jump quickly to the note.
Not for me, works really well, settles instantly so not sure what problem you are having.
I binned my Korg pitchblack when I got the KPA.