I can confirm what Digitaldog posted earlier, that the differences between a Color Munki profile of ~100 patches, and a much larger patch set, if everthing works well, is smaller than what you would expect. I used to use a Color Munki, but, like Digitaldog, I now use an isIs automated patch reader and i1Profiler. 3098 patches is the limit of practical return for me at least, printing with the Epson 7900 and the Canon iPF6300. I can see a difference between that and 1680 patches, but it is very small. Likewise, the difference between the best Color Munki profiles and isIs profiles built on 1680 patches is small, but there to be seen, if you look closely. My problem with the Color Munki is that, for some reason, I could never measure the patches smoothly, and I probably did not have the patience for it anyway. With the isIs you simply load in the chart (and yes, there are feed problems with the isIs) and in less than twenty minutes you can have a profile built on 3000 patches, including a UV compensation. The trade off for all that is the horrific price of an isIs.