Andrew,

It is certainly inexpensive...but is it worth it? I'd appreciate anyone's
opinions or experiences.

I have experience with a similar product, the Monroy ATD-200 and -300

My initial response is sceptical. The mid-air in question occurred not far
from an airport on a nice, VFR day. How useful would something like this
be in that environment?


Well, it depends. Yes, in general it would be very useful. No, in case the
other guys don't have their transponders on or their transponders aren't
interrogated, it will not alert you. But in many cases, it will stil give you
a good heads-up. You may think that not getting azimuth info on the target
(i.e. direction) is a problem, but in my experience, that isn't the case.
These units tell you "Hey, better look outside right now!" - and when you do
that, in most cases you'll spot the target right away, or it will not be a
real factor anyway.

So, in summary, I would say these units are very cheap insurance. And when my
co-owners wanted to get one, I was the sceptic. I'm convinced now. So
convinced actually, that my wife has since started offering these units in her
German pilot shop.

--
Thomas Borchert (EDDH)