They are an approved Supermicro reseller. I've purchased several items from them over the past 2 years.
Only thing to note is that if an item says "drop shipped from manufacturer" it means that it will be shipped to you from Supermicro directly. You may not get proper tracking information in that case.
Every thing I have purchased from them has reached me without issues. I've bought motherboards, chassis, barebones, cables and various other parts from them.