Are MVNOs like Mint Mobile a good deal?

Episode 1770 (1:37:22)

John from Lincoln, NB
Mint Mobile

John wants to know if a third-party cellular company, or MVNO, is really as good a deal as it seems. Leo says he can save a lot of money, but the MVNO buys bandwidth and resells it, so the main provider may prioritize their traffic over the MVNO. Also, traveling internationally may be an issue as he loses the international benefits. But Leo is very happy with Google Fi, which is probably the best. And they have the same international service.