As a Canadian using Rogers, I deliberately went with Sagittarius as it grants access to both Canadian and US carriers. This is important as twice now in Canada Rogers has gone down for a day or more, so now I can automatically jump over to Telus or Bell if this happens again. So far, testing in Vancouver I get Telus 4G and Bell. As soon as I crossed into Bellingham I was on T-Mobile and then further south at Larrabee State Park I noticed I was on AT&T. Always on 4G or better. Smooth seamless switching to whatever network is strongest.
I had a minor issue during setup that required technical support. They emailed back within 6 hours with the solution. For this reason, I strongly suggest testing at home of possible before you travel.
I’ve already referred this plan to a neighbour and a friend, both of whom are also happy with their experiences.