But it still lags a bit, which was never an issue with the 510, and I generally think they could have done a better job with the UI.

The problem is its flawed, and for the price Garmin should have done a better job

It seriously, really does detect traffic approaching from the rear and does a really good job of showing you where it is and how fast it is approaching

Having purchased several Garmin products over the years, I know to avoid them for the first year since I have learned that Garmin does not do a very good job testing their products before they are released

My Edge 705 has done a superb job of that for the 7.5

The phone would see the device, pair up... and just would NOT connect, even with the app downloaded from Garmin (whose web page links were all broken, btw... nice job, Garmin).