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they can smooth it down to the equivilent of many thousands of grit
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No good. Read Dacooltech post.
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DDen's stuff is normally quite good, in this respect
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Agree. However, we can't ask for near perfection and low prices. I received a Maze1C that had imperfections quite visible. It took ~1hour to lap it so it would look almost like in the pics on their website. When I received it, it was far from this look (tarnished and irregular). When I started lapping on a piece of glass (plus the sandpaper, of course), it started shining only at the peripherie, showing slight but obvious warp. I was at 600 grit, I started back at 200, 400, 600 and 1000 and got it flat and shiny.
At ~$40 the water block, we can't ask for aeronautic machining. This is not criticism to DD, I am using their hardware sincer 1 year without problem. Great stuff.
I prefer paying $40 and add 1hour of my work, rather than doubling the price of the block. This is a hobby anyway, I don't count my time.
Just take a 600 grit anspaper, and start lapping it gently. If it start shining on all the surface, then you are OK. If it shines only in the middle, or only at the periphery, go back to 200 grit and lap this baby!