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Hi Dave,
I have all three volumes, and they are about the best investment I have ever made.
I absolutely recommend vol 3. If you have not seen it before, it has lists of objects for each of the 210 maps in Uranometria. Each object has details about size, magnitude, etc, and interesting stuff, like in the case of an open cluster, the number of stars in the cluster, or in the case of a galaxy cluster, the magnitude of the 10th brightest component, or in the case of globular how condensed it is.
One issue you will struggle with using Uranometria without vol 3 is that you will not know what is within the range of your scope, and what is not. It is all very well having hundreds of galaxies plotted on the page, but if many of them are of a magnitude too dim for your skies or aperture, then you will be endlessly disappointed when you cannot find most of them. With volume 3, you can go through the list of objects, and judging by the their size and magnitude, realistically assess what you will be able to see, and what will simply prove too elusive, to try to find.
Vol 3 provides me with something to make notes in, also. I can make annotations on the lists, instead of scribbling over the Uranometria maps.
The only drawback with Uranometria is the sheer size of them. Vol 3 is about 1.5 times the thickness of vols 1 & 2, and is quite heavy to use in the field.
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