1. Voting slider is working right away for any user with any SP.
2. This Dapp uses Steem blockchain so it shows anything posted using any other Dapp like steemit, busy, steepshot, dtube, etc. It's just a client for the whole Steem.
3. Beneficiary is 10%

You can read the official eSteem FAQ for other frequently asked questions like you've asked.

eSteem Surfer is currently working and you can download and use it.