I have purchased two of theirs, both are Centaur based series (Magician from Mars and Air Sub DX), and they are ok. Nice looking and a reasonable price. I won't buy a lot of theirs cuz I collect Centaur based, but overall not bad for the two I have. I am thinking about their Amazing Man collection, but it's to high for me atm.
If you don't know how they print, they print exactly what you see scanned in, no restoration so it looks like a yellow comic page printed on white paper, with a white border. The paper that they print on is nice stock. The book itself is SC with glue binding.
So there are two ways of looking at why they publish them like this, the one I hope they lean to are what was mentioned earlier, for people that want a physical copy. That is the reason why I purchased those series and the fact that they was like 10 buck or so apiece.
One thing that they could add to their copyright page is like what Yoc mentioned: A small paragraph saying something that scans come from DCM and CB+ with respective url's and a blurb saying to visit and bookmark.
Again, this is just my opinion from purchasing a couple and what I think about them.
Blessing