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Willmann-Bell is a small publishing house specialising in astronomical publications. The All sky edition of the atlas was no doubt released to keep size, weight and cost down and perhaps to meet (astronomical) public demand. The Deep Sky Field Guide was originally intended to complement the two volume atlas hence titled volume 3 but can be used with the newer All Sky version of the atlas at least for the main charts it looks like.
Although I have a number of atlases, the All Sky edition is still one I would like to add to my set as my field atlas and keep my other set as my armchair atlas. If you think Uranometria is heavy you should see the Millennium Star Atlas! The only way of keeping weight down is to either have less stars and a smaller scale or to use an electronic device. I use both but never use an electronic device at the telescope as they are just too bright for me whether they be illuminated red or otherwise. A dim red torch and paper atlas is best for my eyes at the telescope.
I think once you start using it you will find it very useful especially in the field for where it was intended but also relaxed in an armchair as you flick through the pages and learn how the sky is pieced together. Enjoy!
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