Yes, secure Adobe from FW is PDF. I guess I haven't found them to be any cheaper than BoB for the most part, plus BoB gets books sometimes weeks before FW. While PDF is compatible with the Opus I'm guessing it doesn't display all that well.
I'd try a few ePub's (grab some from here on MR) to see how you like the format and then decide. I'm pretty sure I'll be changing all of my Mobi files to ePub, but won't decide for sure until I get my Opus delivered and can play with it a bit.
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