Great for Certain Applications
Once you get over the form-factor and interface, this little box has just about everything most of us need - and carries the great sound of the latest generation A&H products. I've primarily installed and set these up in more static situations (churches, schools, restaurants, etc.), which I feel is where the unit really shines.
Once you take the time setting up your necessary scenes, custom UI's, and a few critical functions on the softkeys (which can be a little time-consuming, but I've certainly seen FAR worse UI's on compact digital units), you have strong piece of gear which anyone can use. The ability to control what functions are available through 3 tiers of use "login" is great if the unit is going to be used by those of varying knowledge. With a quick run through the manual, and a solid hour to get acquainted, all of this unit's capabilities can be reached mostly within 3 menu jumps. Despite some minor shortcomings on customization, the UI is quite intuitive and *most* functions can be found with a little common sense. From box to running live with some scenes, I'd say 1-3 hours for most folks - not bad for having such limited real-estate. *NOTE: A&H store the rack ears in a concealed box at the bottom of the box, it's entirely possible to miss them, of if you (GASP) throw the box away, lose them forever (and they are not cheap to replace).
Sound and Performance:
The Qu-Pac actually uses the same pre-amps found in the Qu-32, to the best of my knowledge (the Qu-16 uses slightly different), which ultimately means you can expect to hear some pretty great sound coming out of the box. The Qu-Pac has your expected array of utilities (delay, LPF, GEQ, DCA's (4 I think), and even a few matrixes. There are some pretty decent aesthetic effects as well, a rack (a-la Propellerhead's Reason), with the standout being the reverb - surprisingly clean sounding! There's some chorus, and other, slightly more forgettable built-in effects which I don't personally see getting much use, however always great to have the options! Each channel has the anticipated run of channel-strip functions: Preamp, Pad, PEQ, etc. If you are planning to use the Qu-Pac for a live music situation, good luck. You will either need a lot of rehearsal for your scenes, or ninja-fast hands...unless you have an iPad. The control app is critical for making any changes on the fly with any diligence. So unless you already have an iPad, and are anticipating to use the Qu-Pac as I mentioned, stack a few hundred more dollars onto the pricetag.
Extremely solid construction (don't lose the rack ears); Intuitive, but slow User Interface; requires a lot of custom setup for smooth operation (recommended for static installations); Great sound (same as the Mid-Range of A&H products); USB Scene Storage can be a bit unreliable; Loads of I/O in an "itty bitty living space". There's much more about this unit to talk about, but so little time to fit it in here.
Judgement: If for personal use or a static installation, then go for it! But bring your iPad and save a headache or two.