I’ve just bought the Vodafone Curve.
The Tractive seems better but at 3x the price subscription & 2x initial purchase price.
I’ve only tested it quickly locally but it seems to work well enough. Alerts when he leaves the home geofence and the real-time tracking mode is very accurate, just takes a couple of minutes before updating the fix.
What it doesn’t do, which would be nice but is not the point of the unit, is draw a track on a map. The history is a list of locations that you can click on and it shows the point on a map. If I want to get an actual track of where he’s run then I’ll strap my GPS watch on to his harness.
My plan is to use it on big walks and he can wear it when we’re away in the camper.
(I’m also going to see how I think it will work in the camper as a tracker and maybe get a second one).