I've purchased a couple of these along with the SR-2008 little brother. Although it's weight rating is about the limit you'd want if putting amps into the SR-2012, it handles it well.
A couple of things that people have noted, yes - it is a challenge at first without instructions, but once you work things out, it is pretty obvious how it all comes together.
Comes with both castors or flat feet, which is a nice touch. I can't imagine having it on flat feet though. The thing is a monster when loaded.
A couple of minor issues, the hole covers for the top holes would not fit on both my SR-2012 (didn't have this problem with the SR-2008) so seems like just bad material - too hard - or a bad batch. Also, there was some edge damage to the screw racks on two units, but nothing serious enough that a pair of thick pliers couldn't correct in a couple of seconds.