Well, I skimmed the archives, but couldn't find it. There was a lot of discussion about it, so I'm surprised I wasn't able to easily locate it. You can look yourself, but you need to be a mailing list member
http://lists.davintech.ca/mailman/listinfo/fixed-gear

Eurasia cogs are also ISO threaded and are generally considered high quality. I've got a Eurasia on my MTB and a Eurasia and a Surly on my roadie, both bikes run Surly hubs. No problems with any of them. But then again, they were threaded for each other.