I agree, I picked one up last year and now I won't ride without it!
If anyone does purchase the radar check out the additional mount that is sold, the one that comes with it sucks ass.
I grabbed a garmin quarter turn mount off Amazon. I also have a checkpoint sl5. Works great.
For round seatposts, I have this Garmin brand mount on my cargo eBike.
For some narrow seats, the Garmin branded mount could be a bit wide and may rub the inside of the leg so this one might be a better design.