Garmin Forerunner 55.
It’s the most basic one in the running series, but it works well enough for what I need it to do.
It’s the first real “closed ecosystem” device I own, as usually I go the open source route for everything, but Garmin has a good track record and the device has helped me train for a half marathon really well. I put a “casio”-style watch face on it, and I enjoy it a lot.