Personally I think IR's are a rabbit hole on the KPA.
I would initially avoid as they are not necessary IMO.
So far I agree. The other modelers I've used in the past really required third-party IRs to elevate them. The depth of different profiles is pretty amazing.
At first I was trying to compare it to my Headrush Pedalboard, however I've quickly realized they are apples and oranges.
I couldn't resist though and all weekend I had the Headrush and Kemper on an A/B switch. For the Princeton Reverb tone I like, they are pretty close. Only the most scrutinizing ear could tell them apart blind.