I have to give the counter-argument -- though I realize I am in
the minority. For $100+ bucks less than that otherwise splendid
80GB Intel drive, you get the Apple 128 GB SSD -- more
storage for fewer $$, and still much better than a regular
hard drive.
The problem with this counter argument is that it rests on
an unknown (for me): the exact model you'd get with
a CTO'd Apple SSD, and hence the performance you
can expect from it. Some early purchasers were sorely
disappointed. If you scour the macrumors forums, you'll find
some benchmarks of recent CTO'd Apple SSDs. They looked
very respectable to me -- not sure that the X25 would feel
so much snappier (depending on what you do with it). But
you have no guarantee you'd get the same model. It's entirely
Apple's discretion -- and as far as I can tell they offer no guarantee
on SSD performance, which is a bit annoying.
Many MR people are convinced that the
Apple SSD's are hogs compared to e.g. the X25. But for
me the real question is, are they definitely better than
regular HDs? If so, their lower pricing compared to other SSDs
makes them a reasonable choice.