It utilizes Lightning Network (LND) and Connext to allow for instant off-chain atomic swaps and combines all this infrastructure with a pro trader DEX and a Uniswap-like UX that automates everything involved in executing the swaps. Fees are drastically less than they would be with on-chain atomic swaps. You don't have to download individual blockchains, use metamask, or do any complicated setup. Just download the wallet, let LND sync, and your BTC/LTC is ready to swap after 2 confirmations. In terms of speed, the experience is on-par with CEXs.
I have accounts on multiple CEXs and at this point I'm finding that DEX to be faster and more convenient than any of them.