On 22 Apr 2012 at 12:01, David Riley wrote:
  Depends on your application.  For the wireless sensor
nodes I'm
 designing, they're almost too big. :-)  Certainly too power-
 hungry for a lot of applications. 
I meant that for aging hands and eyes, they're physically too small
to manipulate easily--and far too easy to drop on a carpet and be
gone forever--until discovered by a vacuum cleaner--too late.
--Chuck