Can somone ELI5 what we've learned about Tron from the testnet?

[Crypto Piece]

Basically - pre testnet there was almost no way to figure out if Tron was able to do even a little bit of what it said it could do. I can't read code and the white paper was basically gobberish with no specifics.

Has the testnet started to narrow anything down? How does their DPOS work? How much is the block reward? What's the inflation? Can it handle attack vectors? Is it a copy/paste of another testnet? Did they deliver on all features promised at test bet?