Hey guys, I just wanted to chime in since I was in on this drop and ordered two 'light greys'. Keep in mind, I have never had a PBT spacebar in my life previous to this, though now I have an FC660M with one and I can compare a little better to something else.
I received my package about 15 days ago, opened them up, and immediately pulled the ABS space bar off my Type-S. When I inspected each one, I noticed immediately they were slightly thinner than what I expected, but not by much. Mine have a slightly more grainy texture than the rest of my printed HHKB keycaps, but I actually really like it, and it blends well with the feel of the rest of the board. Many customers were complaining about 'melty' ends where there was no graininess on the right and left top-sides of their bars, I had no such problem, and my keycap texture is very consistent on both. As for tooling marks, I have a barely noticeable 'scratch' less than 1mm in the center, anterior end at the bottom on both, which I almost didn't see initially and when it's snapped in, you can't see that part of the key anyways. Setting them on the straightest table I have, to my eye, neither one had noticeable warping at all, though the center stem on both is SLIGHTLY longer than my ABS one.
I decided to fit one on, and initially, I had to wiggle it in to get it to 'snap' in, but working it around a little did the trick and it fits WELL. I did this for both. And when I say they fit well, I mean, my ABS space bar was often rattling from what I think was it not snugly fitting on the left side to the plastic guide rail it snaps into. In addition to lubing the guides with a bit of Krytox, and trying both of these spacebars, I realize I have no rattle whatsoever now with either PBT key installed. They fit straight and feel great.
Onto the colorways. The 'light greys' I ordered are not exact matches to the HHKB's colors, but they are so close that I can not tell from regular typing distance, and only if I am staring at it from inches away, they are marginally lighter.
All in all, I'm pretty OCD about conditions of new items I buy, but aside from sitting about .1mm higher than the stock ABS spacebar (which is hardly noticeable, and feels better on my thumb), it sounds like I was very lucky in the quality of my purchase, and I feel bad that so many people had such an awful experience with it. I hope MD makes everything right for you guys.
If I have time (unlikely), I will take pictures and post my space bars and outline everything I detailed here.