This is semi-unrelated, and I've kind of lost hope of cryptocurrencies ever achieving popularity (since all everyone seems to do with them is speculate), but I recently came across a page explaining Stellar and it seems to me like it's the best of all worlds (decentralized, fast confirmations, inflationary, no mining, etc).

Does anyone know what the downsides are? I haven't been able to find any posted anywhere, but I don't trust something until I've seen the cons, so I'm wondering if anyone here has looked into it.