It depends of your usage. I have unlimited data in my country and need Silent.Link only for traveling occasionally. I like the flexibility to be able to use it in any country, without pre-buying a package of xGB that I will never finish and expire before my next trip or is not valid in the next country I travel to. Credit never expire, in a year I might topup 5$ of credit, I could use 200MB one day in Europe, then 3 months later 2GB one week in US, again 600MB 6 months later in China and it's still cheaper than a 2GB package in EU from Bitrefill or other that expire in 15 days.