Everything but the keys, right? I've got my opsix right behind me, and I just can't believe how bad the keys are. TBF, it's right above my Moog Matriarch, so that might be a bit of an unfair comparison.
This is more or less a meme on music gear forums, and in my view it's a bit overstated. It's no Fatar to be sure, but it's still in line with what I'd expect from a sub-$1k keyboard. The critical thing they got right is the velocity sensitivity: Especially on an FM synth, you need that expressive range, and the Opsix keys deliver there.
I got a bit triggered by that "sub-$1k keyboard" of yours. I mean, you are totally right, this is a typical product for that price, i.e. this is a "normal" market price for this kind of product… But, man, I just can't get over the fact how ridiculously overpriced these things are! These are such simple devices, so much easier to produce than "classical" music instruments. Yet because of small market and the product being somewhat of a "professional tool" we still get these pretty basic keyboards for $1k+ and behave as if it's a totally fair price because of hammer action and stuff (and take it for granted that $500 devices should have shitty keyboards).
Sure, good mechanics are worth something, but (especially when talking about midi-keyboards) it's the only thing that's complicated in these devices, and it isn't that expensive to produce.
>I just can't get over the fact how ridiculously overpriced these things are!
Surely you understand that you're paying for value, and what's valued here is the combination of the software engineering, hardware design, and the cost of manufacturing, assembling, packaging, warehousing, and shipping the final product.
Korg were blowing out the Opsix on Reverb four months ago for $329.
That's about $50 more than a set of nice cello strings.
I agree that the velocity sensitive is good, but the keybed is by far the worst one in my studio, regardless of price. I have plenty of cheaper keybeds that feel significantly better.
They all share the same core hardware and physical layout and enclosure but have customised front panels.
Actually really good products, well designed, I love the opsix :)