Well, we fitted ADS-B 'out' to our aircraft a while ago but a popular aircraft tracking app shows we're seriously in the minority. I don't think it's worth investing in any 'in' technology until everyone's made by law to fit the same system. We enjoy a wonderful radar service where we get 'G-XX basic service. but...' with helpful advice on conflicting traffic. I've even (once) had 'G-XX turn right now for traffic', without the preamble because the controller thought it urgent enough. Actually, they were a little below us, but the controller wasn't to know that.
The value to us of ADS-B is for student de-briefing for solo navex, though a tablet with Skydemon is probably more accurate.
TOO