(from their website) : ''Opera is a secure and fast environment to build decentralized applications. It is fully permissionless and open-source. Powered by Fantom’s aBFT consensus algorithm, it leverages its speed and fast finality, and is ready for real-world applications with no risks of congestion or long confirmation times. The Fantom Opera mainnet is compatible with the Ethereum Virtual Machine (EVM) and provides full smart contracts support through Solidity.
We designed Opera to overcome the limitations of older generations of blockchains, keeping the compatibility with Ethereum for seamless dApp porting.''
First time I looked at this and I thought: BLA BLA BLA... Can they walk the talk?
10 months later I can tell you this: Fantom is FANTASTIC and Opera is great: speed and low transaction costs.
This is my personal opinion and apparently more people with good repute seem to share this view.
ps. Fantom has some kick ass new projects that we are looking at right now. Do some research, it might lead you to some great gems.