Yesterday, I had the opportunity to use Karoo 3 on the road after switching from Garmin 830. I share the observations:
easy to use,
without thousands of unnecessary options,
fast operation,
quick integration with the light, power measurement, heart rate strap,
and good integration with Suunto (I train running and use Vertical) except for one parameter - calories are not imported to Suunto from Karoo. In Garmin, this integration was at a lower level, but this may be the fault of Suunto’s developers.
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Cool display, even at 0% brightness it is visible, no need to turn it up to 100% as some reviews suggest. I had auto-battery saving turned off - the display was on for exactly 3 hours, the battery dropped from 100 to 77%. So, very good for my rides.
Karoo definitely gets a plus for the speed of the system, maps, notifications (e.g., about no entry), and easy entry point from Garmin to the new service despite the lack of Polish language support.
On the downside, or in need of calibration, the Climb option was a little slow to detect elevation, e.g., the road was already flattening out, but the display still showed the end of the climb. I had a similar experience with Garmin, so maybe it’s a matter of GPS accuracy and location refresh rate.