Their bike GPS range is...not good. I've owned two (Edge something?). Both were completely unusable for bike navigation. They're basically overpriced odometers with a shitty map bolted on as an afterthought.

Updating the maps was an exercise anger management, involving setting up accounts and syncing data to their cloud (why would I want to do that to update a map???). The maps turned out to be woefully out of date even after updating.

I managed to flash recent OSM data to one of the units, but the map rendering is so awful, cluttered, and so slow that this turned out to be just as pointless.