Just ordered a KPA rackmount (no power amp)....again!! Its has been a wild ride since I sold my Kemper 15 months ago. I went on a "try it all" experiment. I have sold them all except the atomic & Bias.
Helix - Didn't like the stock IRs or Presets. Didn't sound much different than a 500hd in my opinion.
Theta Pro - One trick pony, horrible UI
Peavey Vypyr Pro - Some great clean models, especially the Classic series & 5150
DV Multiamp - Some decent patches, UI left much to be desire
Bias FX - Great software, still running it on my Ipad
Atomic Amplifier - Great Value with easy to use editor, some very good amp models
Axe FX II - Some great sounds for sure, a little hard to dial in sounds during a live setting.
In the end I haven't found anything I bonded with as much as the Kemper running Britt's profiles. Little Walter Red is my hands down favorite!!!