Thanks for posting that Mike.
Seems that the people who don't like these things are the ones that haven't used them. Only takes one alarm for traffic you weren't aware of...
You can install FLARM and TXP at the same time, Dan et al. TXP won't be much help with pilots not talking to ATC. I've seen plenty of aircraft up close while squawking with (certified) transponders made by Becker (two installations) Terra (one) and Trig (two). There are no guarantees.
Jim