I can assure you, mine was not painted, it was anodized.
They cast, then mill, however sometimes they don't quite mill enough , which is why they like the blasted finish. It hides imperfections.
The first batch was pathetic. Lots of problems and it seems they sold some prototypes as production models.
The second batch was better, mine centers the keys as good or better than the stock case, however top and bottom alignment could be a bit better. It's enough to feel, but not see. When I went to paint it, I ground it all down to be flat. Both the first and second batch were missing feet, however original buyers can ask for them and get them if they didn't receive them. Unfortunately, they didn't send the rubber pads and more that one person didn't get screws, another got the wrong size.
The third batch is even better, and should be a decent case by now, though it shouldn't take three revisions to get it to be decent. That should have been done prior to release. It's not like it's complicated.
It will fit the CM connector with some creative trimming on the connector, and possibly the case if you want a better fit. At worst, splice the wires and remove the connector. I put in a USB connector on my Filco and Vortex.
Are they worth the money?
Well considering it's pretty much the ONLY option... That's hard to say. You can find MKC cases used, which are good, but by the time you buy one, and ship it, and put a Filco in it, you could buy a Kmac. So if you WANT an aluminum case for a CM or Filco, it's the best option, but that doesn't mean it's worth it.
Would I buy another?
Since I have one, I would rather wait and put my money on someone from the community working on one, there are a few in development, however there's no telling how long it could be, or how much money they will charge. It's also possible they too will have some flaws. There has also been lots of promises of them coming, and then sputter. This is a bit more complicated than group buy of keycaps, so you can't really count on it happening. If I didn't already have one, and had no time frame of a community one, yeah, I would probably consider another.