I have mine grin for some days and test it.
My conclusion is that is coin is a crap and i cant find any reason for this coin to exists.
First it says that is anonymous but requires to open a port to your system to receive a payment.. lol. The other option to receive a payment is through emai... second lol...
Second. It has no limit cap to tokens inflation. 30 mil coin per year. And Dogecoin has no cap but is very easy to use it as an every day payment system. In the other hand grin is by design very difficult to use it as an every day payment system and of course with 30 million tokens per year no one will use it as a store of value.
Third. Chinese miners already exploit grin mining and from the first day mining centralised to big farms.
My conclusion is that Grin for sure is not Bitcoin 2.0 but is Bitcoin 0.1.