Solavei is a MLM, and stuck on the T-Mobile network. If you need/want T-Mobile only coverage, there's far cheaper MVNOs available that will give you "unlimited" talk and text. If you need reception reliability (give you're coming from Verizon) and "unlimited" talk and text on a GSM network, you'd probably be better served on an AT&T MVNO.
Give the Superguide linked in the sigline a read, and don't be afraid to sit down and do the math and see what your average wireless usage numbers are anyway.