I actually have a Hammerhead Karoo. Their UI and their performance and their performance as a touchscreen and display blows Garmin out of the water . Where they are working on improving is adding to the sensor suite, improving reliability and adding features using somewhat the same development strategy that Wahoo did with frequent code sprints and updates. Where the Karoo has really worked for me is in side loading Android apps such as Komoot, Osmand, and Zello (two way walkie talkie). The Android OS is a big (giant) advantage. So I'd keep an eye on them during this next season. If they leverage the Android OS with an app store, fix some their display formatting issues, and further leverage the cellular modem (how about color weather radar superimposed over the nav map, for example) then things are going to get interesting. But to be successful, you can't just do it with a great UI, you have to have a great backend too.

Garmin is following the standard dominant market share leader strategy of incremental gains and minimizing risk - only doing just enough to maintain marketshare and using their bulk to fend off the competitors. That said, that's the same strategy Sony followed with the Walkman (remember those) until they got taken out by Apple with the iPod/iPhone etc... Garmin is saddled with their ancient proprietary OS which makes change difficult. That coupled with their risk aversive strategy leads to a UI that is marginal, IMO. Love to see them wake up or get some serious competition.