I did try the overlander, not what I needed or what I was used to. Ordered it back in June 2020. Still seemed to me not to meet my needs here in the east coast.
That's not the same as the Tread Overlander or Tread Overlander XL
There are lots of great solutions out there, I guess it just depends on what features are most important to you. I have a Lowrance as well as the Tread SxS now. The Tread actually meets all of my needs with exception to the requirement of having a Lowrance for our Baja trips.
From what I have seen, you won't find "native" maps for a lot of the trails out east because they are all private property. That leaves you to A) using an app on a tablet where others have uploaded the trails or B) downloading the GPX files from an app and importing them to a device like the Tread or a Lowrance. True satellite GPS with an external antenna helps when you're in the middle of nowhere. You can buy external antennas for tablets so that is always an option as well.
The Tread has some really great features/functions but not everyone is going to need or want those. Mostly, I would say that you can't look at it as just a GPS device. When I play music via BT through my intercom for in-helmet audio the interface also comes up on my Tread so I can change songs and such from there instead of on my phone. There's a lot of integration possible with it so if you're only looking for GPS and absolutely nothing else then maybe it isn't the best choice.