An important thing to note is that the QC only has a 3 band EQ, and a Gain knob for tweaking the Captures, compared to the KPA's Amp section with many tone shaping parameters. The Neural Captures might be considerably less flexible and tweakable than Profiles.
Also, there doesn't seem to be a "Refine" option for the Capture process. The only visible options on the screen when doing a Capture are "Save" and "Start From Scratch". So if the Capture isn't close enough to be able to tweak to match the amp with the 3 band EQ, you have to literally "Start From Scratch" lol. Idk for sure but the Capture process doesn't seem lightning fast so, that seems like a bit of an oversight and another drawback compared to the KPA.
And Rhett mentions that the effects aren't up to par with the quality of the KPA, Axe FX, and Helix, and that's a huge drawback as well.
I"ve had high hopes for the Quad Cortex. But it's major selling point was that it is supposed to have better quality Neural Captures, Amp Sims, and Effects than everything else on the market - all in one unit. But with where it's at now, it seems like it might just be an all in one unit that has Neural DSP Amp Sims, decent effects, and a decent Neural Capture feature.
The Quad Cortex has the potential to be something next level. If the Capture section has more parameters for tone tweaking, the Captures accuracy improves, and the Effects improve, then maybe it'll be worth the price tag. But as it is right now, I wouldn't waste money on something that doesn't exceed the sonic capabilities of the KPA and my tube amps and pedals! lol My KPA keeps me more than happy as it is lol
(Of course, I mean no disrespect to anyone who is getting this or has invested their hard earned cash into getting one of these units. I just figured the major drawbacks that I noticed should probably be brought to light because they're pretty big drawbacks in my opinion ?)