I've learned the hard way, and through research, that there's basically no such thing as audiophile headphones at this price-point that don't have some quality-control issues, except for the Massdrop stuff (like the HD 58x or 6xx) since they sell stuff cheaply that would normally cost way more if it was from elsewhere. As you know from my posts in the thread about them, I had to go through THREE pairs of the Fidelio X2HR's before i got a pair that didn't have weird issues with channel-imbalance or distortion, and that's a headphone that originally sold for $300 a few years ago before the priced dropped.
In this case, the quality-control issues are something really minor and easily fixed. All you do, if you notice the issue, is take off the pads (super-easy), tighten a few screws, and then put the pads back on (easy). This is MUCH better than something like a pair of X2's with an audible left-right channel-imbalance, which is something that literally cannot be fixed by the customer and requires a return and exchange.
These are BUDGET/CHEAP audiophile headphones. In this price-range, just about EVERY headphone company has units with QC issues. But
Sennheiser is much better at such things than most other companies: For example, Sennheiser headphones ALMOST NEVER have channel-imbalance
The only QC issue that people are reporting for the 560s is something very easily fixed. I still HIGHLY recommend them. I'm listening to them
right now, after I tightened the screws a few days ago, and they sound AMAZING for only $200 with EVERY genre of music, every TV show, and every movie I play through them. They're FAR better than the other 500 series cans like the 579's, 598's, 599's, etc.