I just returned the QC after three weeks. I SO wanted to love!. The KPA generation 1 in my opinion is a superior product and has more power and versatility where it counts.
Pros: the captures and such sounded great, not better than kpa profiles. I like the touch screen for naming things. I like how it took so little room on my desk and could fit in my computer book bag. That's about it. Can function as an interface. But, I already own an interface that I leave on in my office while working, would never want to leave my kpa or QC left on all day so I can use it to listen to music through my studio monitors.
Cons:
1) Dual amps is cool, but I couldn't find a combo I'd prefer to any single amp, so what's the point of adding the complexity for editing sake?
2) No volume compensation. The supposed time saved with a touch screen? I forgot how much I hated compensating volume after making minor gain adjustments; wasted so much time. Set up some scenes with different gain stages, then realize that overall it's too loud compared to other presets. back and forth, back and forth adjust, adjust, compare, hit save, repeat...... Oh wait, I could just adjust the overall volume by adding a EQ effect at end of chain, darn not enough DSP.
3) No dual delays. You NEED to set up a parallel path to merely have a 1/4 and 1/8 dotted delay. Delays in general were quite limited compared to KPA. The kpa delays come with so much complexity that I personally never need two at the same moment in time anyway; with spillover in the delay slot, there's no need to cram additional delays in the same Rig for other songs or parts of songs; just copy paste the rig and add a different delay.
4) No effect presets. You can only set the default for an effect type. Huge waste of time.
5) No ducking anything. I use ducking delays and even a little ducking on more ambient reverb all the time, cuts down on tap dancing. KPA has ducking on all delays, reverbs, mods, pitch, etc.
6) No editor: the touch screen speeds some things up, but then it's on the floor, whereas the iPad/iphone app for the kpa takes a moment to turn on.
7) Not enough foot switches, which are too close together btw. You have to use Scenes since there's an audio gap and no spillover between presets. But it's cumbersome to get to another preset; getting back to preset mode requires stepping on two switches, and then hit them together again to get back to Scene mode. BTW the footswitches make this irritating scratchy sound when pressed. The KPA's front row of switches are closer to the ground requiring less foot raising and easier access to the second row as well. No dedicated tuner button on the QC, I kept screwing up the bpm trying to access the tuner.
7) a vulgar exaggeration of power. I ran out of DSP using a compressor, 1 OD, two captures, an EQ, two delays (necessary because they don't have a dual delay model) and a reverb! I had to turn off the global EQ! And yes I correctly spread everything out among two sections to utilize all of its DSP. Though the kpa only does one profile at time, I could do all of these other things on the kpa, only needing 1 delay module to do what QC needs two to do, add an extra OD model, add a couple mod effects, utilize the looper, transpose, a 2nd compressor via the amp block compression, no need to turn off the global eq! Even better I can do all this on the kpa and go to another rig without an audio gap and maintain spillover, unlike the QC.
The capture menu on the QC is an absolute mess. Even though I downloaded less than 100 amps+cabs, presets, and OD captures it was a total pain to find what I was looking for. Totally disorganized, unsearchable, stupid categories. Suppose you capture the amp and speaker of a Fender twin? This would go in one category. Then capture the Fender twin plugged into a physical separate guitar cabinet. This is supposed to go in another category! Even though they're both capturing an amplifier and a speaker! Create or worse download a bunch of captures and try and remember which ones are in which category! and then scroll down the whole list of each trying to find the one you are looking for.