I've been running my for more than a week now. I haven't had the need to do any manual maintenance during this time (which is extremely good since they are located ~1h car drive away from my home...). I am going there today however to do some tweaking to the cabinet and installing a IP cam. Someone asked for some photos of the units, I'm gonna take some today.

About the performance;

When you're mining just a single coin (with fixed difficulty rate of 128000) they deliver almost exacly the promised hashrates. And they don't require any sort of maintenance. Haven't had to manually reboot (manually = remotely via web interface) or anything, they just work, day after day.

Then there are the multicoin pools. Apparently these units don't like that or the variable difficulty that much. They do deliver great hashrates but sometimes some of the asic cluster go to "Dead" status which is a problem that apparently can only be resolved by manually rebooting the machine (not sure though). VERY annoying. And the provided documentation is a joke. It gets you started but that's it. I'd love to see some explanation for the status page on web interface (fe. what is "HW", I know it's some sort of error indicator but ...).

Also about the appearance; I looked up some pictures of L3+ and for a bit of my surprise, ít looks almost 100% identical to the A4+. Also the web interface is almost 1:1 match.  

EDIT: A close up of one unit (they are secured in place, it's nearly impossible to take picture of the whole tube due to how they are installed): https://i.imgur.com/HXPwHIr.jpg