Well after spending a month with the Quad Cortex, I ended up returning it. I found that for my needs, it was too unreliable and I spent a lot of time that I should have been practicing, being frustrated at the software bugs. I seemed to be constantly trying to find workarounds for stuff that came naturally on the Kemper, and there is a weird ground loop issue where I'd get noise unless I touched something metal (eg a foot switch). The onboard Wi-Fi is a fantastic feature, and one that I wish my profiler had (Hey Kemper, can we get an upgrade program for older profilers to add Wi-Fi?!) but the QC's Wi-Fi was super unreliable and dropped out constantly, one of the major annoyances I had when using it.
All in all, I will probably revisit the Quad Cortex in a couple of years after it's had a chance to mature, but it's just not at the level I need it to be at this time. I suppose time will tell how the QC will be supported by Neural DSP; despite them saying it is one of the highest priorities, I definitely do not get that feeling when visiting the forums or even receiving their newsletters. Sure, they have pushed an update in the 30 days I've owned the unit, but the list of "feature requests" grows longer every time I visit their forum...
After returning the QC, I bit the bullet and ordered a powered Kemper Kabinet, and I think I will be happy for many more years with the Kemper