Well, I got quite a few responses, but of them:
- All of them were out of the country
- *Almost* all of them were for DVB and PAL
- The one user reporting an issue with an NTSC device was in Canada.
No disrespect to any users I'm dealing with who might have just read the above sentence.
Obviously, I can't afford to go out and buy all these devices. Kworld, Artec, Asus, Dvico - Even at the low cost of $40-$50 each, there are just too many of them. Not to mention that I only need them for a relatively short period of time to get them working (a few days) and then they join the pile of tuners I already have which I don't need.
On the upside, the em28xx driver in general is continuing to improve. Things are getting cleaned up, edge cases are being ironed out.