We know that not all GA transponds, so fitting a PCAS wouldn't let me find them, and since I don't transpond they will be in blissful ignorance of me until they fit a Flarm (once mine is borught and fitted, which will be next month).
I'd buy FLARM if all gliders fit it. I already have a transponder (which technically we do not NEED to have), and PCAS interfaced to my 496 (and it shows up LOTS of traffic). We are alos painted dark blue and red. However I suspect that maybe 25% of gliders have FLARM, if we're lucky? You yourself are yet to fit FLARM which has been around years. Someone publish some useful stats on how many UK gliders have FLARM fitted and if it is significantly over 50% I'll order a box tomorrow.
FTR, I reckon that probably 90% of US gliders have Transponders - maybe they don't always turn them on, but I bet they have them. How come they CAN DO yet in typical British fashion, we CAN'T DO ?