I've owned one. It's a top loader with a window where you can see the tubes which are backlit by a blue LED. When I think back on it, now I probably should have kept it, but I was in a Transport frenzy at the time and wanted to try one of everything. As far as mods go, short of rolling tubes and upgrading the power cord, there wasn't much in the way of forum threads at the time so I didn't go any further. MHZS is a product out of Hong Kong built in the same factory as Original,Yaqin, Markhill, Grant Audio, Consonance, Prima Luna, Vincent and a few others. It's good stuff!
Reflecting back it had great sound and upsampling on the remote that could be switched on the fly. It also had balanced and single ended outputs. The remote could be used as a weapon too...very heavy and black to match the player. From this player I went on to sample the products from Original like the 2008 and the Leonardo. It's a great player for the money though (MHZS CD66 and CD88) and loaded with features. But it was a hard sell amongst the sea of Krell, CEC and some of the others you could have used in the same price range as a CD66 new. Hopes this helps.