Tim,

this is the problem with depending on personal experience rather than
statistics. Unfortunately, sailplane ELT activation appears not to be
reported in accident investigations. Therefore, we have to depend on GA
statistics (and their tortuous path into being). At best, activation is
75%. At worst, about 25%. Let's split the difference and call it a coin
toss. The real problem with the 121.5 units is the false alarm rate.
This costs resources. Imagine how many fire houses we'd need if the
false alarm rate was 97%, or more accurately, how many houses would
burn down. If you can't think of a single non-activation, how many
times have you seen the CAP looking for an ELT in a hangar, trailer, or
tie-down?

BTW, I'm searching for two 406 units for our gliders. I can either
continue my own research and buy them direct from the manufacturer...
or buy them from a soaring supplier. I know there are a large number
of pilots who share my preference, both in equipment and source. But it
doesn't seem like any vendor is making an effort to satisfy the need.
Am I missing something?