Tape-out is fine, but doesn't really mean much beyond "things are progressing". They won't know that the chips actually work until they get them fabbed, packaged, and tested. Even if they do functionally work, they may not meet speed or power requirements. Anyone remember BFL?

I'm waiting for the announcement and proof that they have working prototypes hashing at X GH/s and using Y watts. If they can demonstrate a good product at a good price, I'll consider buying. Otherwise no.