I built my kit Fox 20 years ago and installed a txp with mode c . I occasionally fly in class b, c, and above 10,000. Now wondering if I should just remove it as those areas will be off limits unless I install ADSB. No more $100 to get transponder checks that are just like a medical in that they tell you the unit is working at the time tested but could fail on the next flight. I would be inclined to keep it if you could self verify with a call to ATC but I'm sure that isn't gonna happen. So...please convince me why I should keep the txp.
ThanksJimS