Since I see you both V8guitar and Steve5478 interested, I'm going to explain my issues and my disenchantment with Kemper OS.
What I wanted was to be able to replicate my valve amp + pedalboard live rig with just one digital device. This -IMHO- should be the first approach of these type of devices.
The first issue I happened to see with Kemper in general is that you can't purposely oblige people to just have 4 effects in their signal chain. That just is not happening in real word for most of us. The second is even worse: You're limited to 4 effects before the amp and 4 effects after the amp. So you'll have to decide which ones you want to be able to activate because you only have 4 hardware switches.
I understood these things and thought that their way to think about this device is that you use the 1-5 slots predefined for each part of a song - but that's limited to just the users that want to use it that way. In my case, my gigs used to be 4 hours-long with medleys of songs that could last more than 20 minutes straight of music - you can imagine that I wasn't able to use the Stage that way.
BUT what I believe is really simple - in terms of programming a digital device - is to let people decide where they want the effect blocks. If so, my case wouldn't be so dramatic because I just need 5 FX, all of them after the stack (because I used the slots for my gain stages), and as you probably know, it is possible to assign the looper switch to another effect. But no, can't do that since I have octaver, chorus, delay and short reverb already after the stack. If I want the long reverb -which is my 5th effect- I have to change to the next performance where I have the same setup but the reverb module has a long reverb and it's active whenever I change to that next performance.
This situation would be even worse for those who like to use a lot of effect pedals inside the same song after the stack. At least Quad Cortex -which obviously has its cons- let's you assign the switches to whatever block you want in stomp mode, so theoretically you'll get up to 8 effects.
I hope I didn't bother anyone on this 😅 Kemper still being an incredible device and I'm really happy I purchased it quite some time ago, but for me it has these type of cons that makes me wonder if Quad Cortex would be better in this sense.
Cheers!