This is one of the cryptocurrencies designed for privacy, using various protocols that are trivially added to hide. Protecting blockchain values without controls from companies or individuals.
Its chain becomes lighter since with the same mining power, data from previous transactions is eliminated but with total security.
In general, Grin is a young cryptocurrency that enters the blockchain market quickly and with great growth in its capitalization and daily volume.
In purchase with other assets related to private cryptocurrencies Grin is based on a blockchain verified differently with a new protocol.
-It is open source and highly verifiable, which makes possible chain auditing.
-This asset is only a chain for BTC-style transactions without admitting contracts or side chains.
-Totally dependent on third party donations. There is no self-sustaining model in the future depend 100% of the community.
-Mimblewimble protocol focused on privacy
-Has a large number of competitors with extensive experience and stronger development communities.
To conclude this project is really new and it is difficult to give an objective and final verdict, so I believe that if they continue along this path they can give many surprises since all those involved are really committed to grin.