Mine is far from run in, but a couple of observations. The slow speed running is pretty good, in my opinion better than the Tenshodo. I have found it runs better with a feedback controller and at the moment, powering with a straight DC supply is not quite so good and highlights a slight tight spot, I expect this to go with use. I do have reservations about running it on a continuous layout for any length of time with a feedback controller as past experience has shown that the small Mabuchi motors, do overheat if run continuously with feedback.
The metal construction is certainly an advantage and it runs very well without any additional weight, strangely adding weight doesn't seem to make much difference, although I'm sure it will aid pick-up. Initially it was very reluctant to run on anything but the cleanest of track, but this seems to have improved now. After running it for a while with graphite on the track and a Relco track cleaner, there is now no sign of it stalling at all, even climbing on and off the traverser on my little layout, so I guess it was a question of cleaning the coating off the wheels, it may also be that my track was dirtier than I thought.
Quiet I'm afraid is not a description I would use for it, but as it gets quieter with use, there is some hope. It does have quite a distinctive growl.
As most will know my knowledge of DCC is non-existant, I don't know how easy it would be to fit. It has individual pick-up plates underneath, one side is grounded directly to the chassis block and then a short length of wire from the chassis block to one motor terminal, the other side has a length of wire from the pick-up plate directly to the other terminal. It would be very simple to detach this wire and connect it to an overhead power supply which is how a lot of these units are used.
I suppose in conclusion that MY OPINION and using my control equipment, is that these are better than a Tenshodo, but fall a little short of the performance of a Black Beetle, but not by much and they are half the price. I'm going to give it a thorough test next weekend at the Pewsey show, so it will be interesting to see how it performs running continuously.
I hope this helps.