I have been using this service for about a year and a half now and I have to say the cost is great but you get what you pay for. It's very unreliable (drops incoming calls, and incoming texts are delayed very frequently) and there are lots of places my friends will have coverage that I will simply have no network at all. So it's servicable, and I would recommend for e.g. a hobby project that needs a cell data connection like a Pinephone/Librem 5, but not for critical cell lines that you need to guarantee won't miss calls.