Would love to see pictures of the units. Where are you located and when did you receive them? I know of some people in the USA that have not received them yet...
Last Picture... 63 L21 running for 4 months already at 30-35 GH total rate. (at current diff 4-4,3 LTC x day)
http://inkamining.com/talk/inkaminingl21.jpgWe use the BW provided power supply and so far no problems.
This Datacenter runs BW L21 for Scrypt merged LTC/DOGE , Canaan Avalon 741 and Bitmain Antminer S9 for SHA256 BTC/BCH and finally BW E22 RIGS for ETH+DCR / ETC+DCR / XMR
Note: E22 Rig = 6 Nvidia p106 mining at 144 MH ETH