
While the Nord C2D as a pipe organ will not compete with a custom built console with tracker action keys, expensive multi-channel amps, and an expensive computer running Hauptwerk, the sounds of the stops alone put it on comparable footing to the entry level offerings of studio/practice organs by companies like Allen, Rodgers, Johannes, etc. You'd probably find that you prefer the keyboard action in instruments by these companies. That's fair. Remember that the C2D weighs less than 35 pounds and can be carried under one arm. Even the most sparing Hauptwerk setup will be more difficult to move.
The disposition is thoughtful and sensible. The swell division has a nice principle chorus of a more delicate nature built on the Fugara 8, Principal 4. The swell's Rohrflote 8 is pleasantly bright and together with a Spitz 4 and Flote 2, the flute chorus is delightful. The Vox celeste 8 blends richly with either. The mutations in the Nasat and Scharff provide ample opportunities for adding brilliance. Personally, I would have preferred a Swell division comprised entirely of flutes up to and including a 1-3/5 for more options for constructing cornets but... whatever. The Great has as strong principle chorus, a thin and bright Gamba 8, and a woody Gedackt that has an almost overwhelming low register but a bright and airy upper. The Quinta and Mixtur are nice and strong. The Pedal division is limited to a boomy Subbas 16 which becomes a Fagot 16 when the drawbar is fully extended, and a Gedackt 8. The Reeds, an Oboe 8 on swell or Trumpet 8 on Great, like many produced from speakers, sound silly when played solo. In combination with other stops however they open up nicely. The Gamba 8 and Trumpet go together very nicely for example, the Gamba adding just the right amount of body to an otherwise silly, nasal, trumpet sound.
The couplers enable loads of possibilities, from adding pipes at 16' pitch on the swell or coupling the swell at 16' pitch to the Great (great for French classical music!) to coupling the manuals in various configurations. There's also a handy 4' coupler on the Swell which works as a useful stand-in for various mutation registrations.
Couple of caveats. Depending on the number of stops you have pulled, and the number of keys you depress on the keyboard, you may find that your polyphony is limited. The compounding processing power required to play one note per stop pulled per key depressed eats up CPU like crazy. It's common in many electric organs to begin limiting the individual notes played as the organ gets fuller. That said, unless you're playing massive full organ chords with all ten fingers, toes, and your nose I don't think you'll notice. I haven't noticed. Nord is clear about this on their website without getting into details.
So there it is. It's a great little practice organ! I has precise, unforgiving action (perfect for practice!!). It has a very sensible set of registration possibilities for a variety of styles of pipe organ music, and most importantly, it does all of this with an AMAZINGLY SMALL, easily transportable footprint!! You pull drawbars instead of stop levers. You push buttons instead of pistons. There's no fussing with 3 power switches and the occasional MIDI mishap. As my British friends might say, "I'm absolutely chuffed!"
So, if you've read this all the way to the end, I'm sorry you're such an organ geek

And many thanks to the other Pipe Organists on here who have made small comments about the C2D's pipe organ from time to time. You were all crucial in helping me find a practice organ.
EDIT: RE: NORD PK27 Pedal Keys 27 Midi Bass Pedals --- (had a few requests and I'm sorry I neglected it originally):
The pedals are obviously front hinged which gives them a different playing "feel" than a traditional rear-hinged pedalboard. Then again, it only weighs 35ish pounds so...? Pedal spacing is approx. 2.5' on center, approx 17.5 for an octave which is par for the course for AGO spec. Obviously it's not a convex or radiating board but as a flat pedal board it's wonderful for practice. My feel are USA size 11 and I find the pedals are long enough to make heel/toe and legato playing on the natural keys possible. If you have massive feet, or if you're accustomed to playing further back from the sharp keys on a traditional pedalboard your experience may differ. If you were only interested in learning to play pipe organ the Nord would be an adequate solution up until a point, after which you'd probably start to feel limited by it. That said, as someone who is predominantly a pipe organist, I find the Nord Pedals to be a VERY convenient solution.
At the very least, the light weight and easy action make them FABULOUS for stomping out bass lines.