For black and white images I think the Proline Pearl is quite adequate. I had not been aware of the outline of prints showing through on my two sample books so far, and I have looked through them closely several times. After reading David's comments I went back and looked again. Yes indeed, on text-only pages with an image on the reverse, I can see very faintly the outline of the image on the reverse. But I could only see it when looking specifically for it, as it is extremely faint.
Vivid colors would be different, of course, and I'll have to face that challenge on my next book.
It seems to me that some of the posters in this thread are hoping that a reasonably priced book can look just like a set of well-printed inkjet prints. I expect that only something like Marcin's Canon monster is likely to be able to do that good a job, and the price is likely to be comparable to printing the inkjets yourself and having them bound.
I have printed my own calendars for several years, using double-sided papers from various makers such as Ilford with good results, but I'm not about to try that for 100 or so copies of a 100-page book.
-Eric
