Like he said, if you already have one (I do), not much incentive to upgrade. I have a Wahoo that links up via Ant+, so the bluetooth functionality isn't a draw. I guess if you didn't have a bike computer and wanted to use your smartphone with the radar, you might be interested.

I'm curious who is interested in just the radar without the taillight, especially given that it's a really good/visible light. But they must have thought there was a market for it.