Upgrade to the FOBO Bike, the FOB Bike 2 was just released. $100 US, smaller and run of of Bluetooth 5.0.
So far they work great. No much to review as you screw them on, set up the app... all in all it takes about 10 min. Like them so far.
Have used them on my R3R for four years, many long trips and about 45K miles with no issues.
Fro me, there was a learning curve in how to connect and operate.
Heaps of them these days some have their own screen and some bluetooth to your phone.
This has it's own screen which I would prefer.
I have them with my Garmin Zumo already but they are much more expensive and in some ways not as good as you have to scan down while riding to see them but they alert when it drops below your preset alert level and flashes on screen.