There is tons of cheaper alternatives now. Some chinese brand. The implementation is particularly hard to get right (how to avoid object that enters the radar field of view like passing next to a fence among other tricky scenario like a car that follow at the same speed as you but suddenly accelerate to pass you, etc). A lot of competiting radars will have false positives or negatives. That’s why Garmin is still the favorite product on the market. Wahoo just released one as well, and the reviews are quite positive so far. Bryton makes one, Magene, Giant, Trek, igpsport, etc.