Looks very unstable, but guy is probalby minning some ubercrapcoin. Eitherway L3 looks nice but given S9 issues and first scrypt miner from Bitmain, i wouldn't trust it. One breakdown a year and you will lose all you gained from electricity.
Now is too early tell something bad about L3 because at least it holds the parameters of the specification as opposed to A4 batch1. In addition Inno 45 days of warranty vs Bitmain 90 days.