Replace 350?

No.

If you have a need/desire to store routes on the unit, download the trip log from the unit, use voice commands, have lane assist, have speed limits show on the map screen, show 3D buildings, you might want to look at some of the newer units.

I agree completely.

I'll add that if a 350 owner doesn't already have lifetime ad-less FM traffic (may require a GTM20 purchase by horseyride) on the 350 and wants lifetime traffic...or plans to buy lifetime maps, it may be worthwhile to add these 1-2 lifetime options to a newer model.

Then again, maybe horseyride should keep the 350 until the horse-specific model comes out--I'd expect a new mounting system and would suggest avoiding use of the beanbag system, especially around hungry horses.

...a 350, 360(2), and a 370. Unless you want the bluetooth gadget, keep what you have, unless you have much cash laying around doing nothing!