I have come to love the transpose feature on my Kemper, it's very useful.
I find it spot on when raising/lowering the tuning by one or two semitones. When things are raised/lowered by higher increments, it becomes a bit more difficult to justify its usability in a recording or live context.
Hoping Mr CK can improve an already excellent algorithm to reduce artifacts and make things "real" (a funny thing to say about a feature like this, imo)!