Which company is using the ERC 223 Standard? and is it ready for usage?
i have found project ethereum commonwealth or dexaran - i dont know exactly

this project working realy on good things which can fix problems which ethereum currently have.... t
hey are working on: 1. infrastructure improvments -- DexNx, PR Company, Solidity Coding Standard, Governance system, Token exchange,
2. Maitaining compability with ethereum -- GETH Classics, Mist Classics, Port of Metamask, ECNS
3. Important protocol updates -- Raiden, Swarm classics, Virtual Machine, zk-Snarks
4. smart contracts -- ERC223 token support with support of decentraized apps
.I thing it is very promising project...i havent invested so far but i am watching it - maybe later i will invest there 100 euro.......it looks similar to bitcoin -- mysterious developer satoshi nakamoto who want do improve-change something - now mysterious Dexaran from ethereum classic

who know, perhaps it could be successfull project - perhaps not
