How does twist cap measure up against normal crown

From personal experience it would be hard to say, but I've not had a major problem with flat or oxidized beer in twist-off bottles. In fact I don't think I've had any such problems.

"Many?" Really? I haven't seen many caps at all fail on commercial beers. The only ones I have seen fail have been crown caps, though, and they've all been imports.

I've never seem any to fail. Out of curiosity, I shook up the 12-pack with twist caps (Capital Special Pilsner) and none showed any signs of the leak. Personally, I doubt there is anything inherently wrong with properly execured twist caps. it's probably the same deal as with wines - corks are traditional, yet they suck in many respects, and yet there is always someone claiming twist open bottles are in more then one way inferior.

DK

The commercial twist-off cappers are most probably in the $500,000 range. Even if I had one I would probably waste half of my brew and a lot of time setting the capper correctly, either leaking bottle caps or crushing the bottles.

I have no experience in the brewery industry but I do have a lot of experience in the manufacturing and packaging industry.