Surecheck trafficscope - any experiences or opinions?

A fellow member of a local aviation group was recently killed in a mid-air.
Another member found and posted this link to our mailing list:

http://www.surecheck.net/avionics/micro.html

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

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?

Thanks...

Andrew