Proof of stake will take ETH from a power consuming Proof of Work situation to a less power consuming situation. You have to hold on to the coin to be given the distribution. Wallet software can handle syncing the blockchain as well as handle the transactions. I'm coming around to POS, much thanks to Steemit. We stake our Steem power here. I'm still working on setting up the mining tho for STEEM: https://steemit.com/steemhelp/@krystox/mining-steem-for-dummies-on-mac-os