"When channel is funded in a special way an amount present in it can be spent immediately, without waiting for a funding transaction to become confirmed. This introduces no additional risks to either channel side, can be standardized with minor Lightning protocol changes and works on TestNet today..."
I tried it on testnet and it feels magical. You click the QR code at https://lightning-wallet.com/instant/ with testnet wallet and instantly you have a channel and I paid starblocks right away.
Security is another thing. I would think twice before paying fiat or anything for this because they could double spend it very easily.