Instant on: Your client does not download the blockchain. It uses a network of specialized servers that index the blockchain. 

Forgiving: Your wallet can be recovered from a secret seed. 

Safe: Your seed and private keys are encrypted on your hard drive. They are never sent to the servers. 

Low trust: Information received from the servers is verified using SPV. Servers are authenticated using SSL. 

No downtimes: Your client is not tied to a particular server; it will switch instantly if your server is down. 

Cold Storage: Sign transactions from a computer that is always offline. Broadcast them using a machine that does not have your keys. 

Established: Electrum Cash is open source and was first released in August 2017.