a credible offering or a pig in a poke
It's the Mark 1. We know (some through experience and some by learning from the mistakes of others) all about "Mark 1"'s.
Although I doubt if they planned it like this, but the RPi people seem to have got the hacker community to do the beta-testing for them. Discovering the real-world problems is always a necessary task and one that's usually devolved to the early adopters who, through the powers of marketing, seem to be happy to spend their money on unproven stuff in return for the bragging rights of "I was in at the beginning".
[Disclaimer: sometime between now and (hopefully) christmas (hopefully 2012) I'll get to the top of the list and be invited into the RPi store, too.]
What should be happening now is that the professional designers will be looking at all the criticisms and feedback. They'll be tearing apart the initial designs and looking for improvements. With some luck, the current run of Mark 1's will be superceded by faster, cooler (in all senses), more reliable boards using up-to-date chips with more memory, peripherals and a better layout (you really don't want I-O on all sides of the board) that may cost more but be generally better suited to mass-use.
Depending on when that happens, I may grab a Mk 1 when the time comes - or I may get the opportunity to buy a Mk2 when the current design gets obsoleted.