I think a lot of the build quality issues apply to how you play. For many with a very light touch, the flyweights are perfectly fine. For those with a stronger, maybe more piano-based touch, the muscularity can make topping out the velocity, and a lot of stand 'bounce' quite apparent.

And it's not good enough to say 'well, just adjust your technique'. It takes years to develop a style and touch all your own. It's no easier for a heavier player to dial back their touch as it is for a flyweight player to be able to control a real piano keyboard for any length of time.

Add to that the fact that, just as you play the keys harder, you also have a tendency to hit the buttons harder (it's very hard to dial it back just for the buttons!), and the reliability and durability of the buttons becomes MUCH more important that it would to the lightweights.

So we have two camps, and BOTH their opinions are correct... at least for themselves! But it's nice to see us abandoning the number of keys for a while as a source of conflict. Back to the old classic of weight above all else. Yawn... Is it Groundhog Day again?

BTW, Kingfrog.... the G70's sequencer is as fully featured as the Korg's, just in case you didn't know (it also has Workstation as a panel graphic!). It's all marketing hype, anyway, as neither of them is a 'workstation' in the modern sense of the word... arpeggiators and audio multi-tracking seem to be the LAST thing they want to add to arrangers. Might spell the end of the WS if they did...

Plus the G70 has something they call Makeup Tools, which is BY FAR the easiest way I have ever come across to make Tone, effects, dynamics, EQ and mix adjustments to an existing SMF or Style. A real time saver...

Do yourself a favor, and try to get some quality time on a G70 before you plunk down nearly double on that PA2X. It might float your boat, and save you some cash...
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An arranger is just a tool. What matters is what you build with it..!