It's a good show. I would never recommend to subscribe to a service for one show alone though. Why don't you sign up for a free trial, binge-watch the show, check out what else amazon offers, then decide whether to keep or cancel your membership?
I'm really enjoying it, haven't had a chance to watch the last episode yet as one of the kids always seems to be awake when I try to watch it. I have heard that there's been a lot cut that they filmed and that it's different to the comics (adding spoiler if you don't know what the characters are like) like homelander jerking it and cumming on the crowed while he stands on a roof top. They really wanted to a lot more but weren't allowed.