Lots of fans of the Explore 2, i see. I've had one for nearly 2 years and have been mostly happy with it, the software for Garmins has improved no end since i had a 510. It's also much better value for money than the more performance-focused models.
But 3 gripes:
1) Bluetooth sync with the Garmin Connect app on my phone is painfully slow, and has been a common complaint of Garmin devices for years.
2) if i diverge from a planned route, it's slow to recalculate. And if I'm cycling during recalculation it can have a hissy fit and have to start again.
3) there's no digital compass/magnetometer, so it doesnt know which direction i'm facing when GPS reception is weak or if i'm stationary. That's rarely an issue in the countryside, but my recent "London lockdown" ride was VERY urban, and gps went a bit haywire a few times, particularly near Canary Wharf.
And my eyesight has worsened in 2 years to the point where the display options can't entirely compensate for the small screen size; i recently completed a ride wearing reading specs.