Nice . Reliability problems can be fixed, better to be fast out the box and not as reliable than reliable but slow as the latter takes much longer to fix if at all.
That was the case with RB6, if you remember, all kinds of mechanical issues, but since then they've got some internal systems in control, like lasers for details, etc, and the result was visible on RB7.
So, in that regard, I kind of disagree that early reliability issues should be discarded with just a simple speed in mind. Imagine an ultra-fast car that can't handle the corner and it ends up in the wall, or wears certain parts too quickly.
But nonetheless, since this is twitter speculation, we can safely judge after couple of races down the 2012 season.