I just recently got a Soma cog, and have been runnning a DA for over a year. The DA is great. Excellent quality, excellent wear, nice black finish.

The Soma I got is runnning fine, but I do question the quality. The finish seems iffy, and the teeth are razor sharp. As well, Brent from Phil Wood just issued some stern words of warning about the Soma cogs, so I may try to replace it with a DA.

I haven't tried the EAI, but I hear they're awesome.