I have noticed there prices tend to be a bit higher than Pangolinminer (for same shipping times), but at the time everything on Pangolinminer was Dec delivery only.
Unit is up and running good so far.
As for the M20 itself;
The thing is a beast for weight (twice that of any of my Antminers) and louder than any Antminer I have had so far (S9's T15, S15).
It does have a low power option as well, but does NOT function. Hopefully they will update firmware sometime soon.
It is hashing at speed claimed but just a little higher power draw than advertised (but withing specs) at 49.5 W per Th/s.
When did you order? I never saw m20's the normal 45th models for sale in stock on pango or whatsminer ever. It was always preorder for aug, sept, oct, nov, now december. I have a few on order for october but I would like to find some this month to replace old gear as well. No luck though.