To all, the MRX is sold, thanks.

The weather has been a little dicey for flying, but tomorrow looks
better. I'm really looking forward to a close encounter with another
PF equipped aircraft . . . though that'll have to wait as PF density
is low to non existant. SoaringNV has one, though not installed yet,
so I may be able to arrange an air-to-air PF to PF test soon I guess.

I agree the MRX is good. I've flown with it alongside my older, and
much larger Proxalert R-5 a number of times. Their performance is
essentially similar in terms of sensitivity, though range of threat
aircraft displayed varies back and forth between the two as one might
expect. The R-5 gets the nod for providing more info, as it displays
up to three threats at a time along with their squawk code. Squawk is
nice as you can tell if it's a glider (0440-here), descreet code - IFR
- and probably looking for me, or VFR (1200) not talking to ATC -
thus likely not informed of my presence. So I mostly flew with the R-5
in my power planes and only used the smaller MRX in the glider.

Since the MRK is sold, I won't do the comparison to the PF directly.
However, I'll compare the PF to the R-5 and report back. Given the
PF's ground performance, showing ADS-B airliners as far out as the 32
nm range scale and Mode-C around 16 nm or so, it should do fine as a
PCAS - I hope.

bumper