The unit weighs only about 3 lbs and arrived practically brand new.  I purchased mine from RefurbTechnologies and received exactly identical specs as described on Amazon (including quad-core i5).  The PC casing opens by one screw only, and I was able to swap out Win10 SSD to my existing Win7 SSD ....100% plug-n-play, no hardware or BIOS issues.  Updated a few HP drivers (USB 3.0, Realtek Equalizer and Intel graphics).  Only using 8 MB RAM, which is OK for Win7.  Comes with 2 types of HDMI screen adaptor and a free HDMI cable.  Bottom and backside are well ventilated and PC is barely warm....