Should you choose to make a Salt investment you'll be getting a lot more than a speculative asset. Your tokens also give you the ability take out loans on the blockchain using your cryptocurrency as collateral.
In the future, I'm positive that this will be a very popular method of utilizing assets to gain funding, and this project is an early mover in this space. This will likely benefit them greatly in an area that is sure to become very popular in the next few years. The platform is totally functional, and it's already funded over $30,000,000 in cryptocurrency backed loans.
You can buy Salt on most popular exchanges. There's ample volume in both Bitcoin and Ethereum trading pairs should you have a preference of which currency you'd like to trade with.
These are ERC20 tokens, and as such, you can keep them safely in any compatible Ethereum asset wallet. This includes options like My Ether Wallet, Ledger hardware wallet, the Coinomi app or MetaMask.