Thanks!
That is a good blog post. I should have mentioned it in my initial post.
That and an indirect forum reference when comparing the 120 and 110 are the best my google-fu drew up. My current search skills on Flickr and Instagram have not drawn anything definitive (a few close images of plants which might have used a tube or might have been cropped).
My main interests are in use for tabletop or food and using the combination for focus stacking, but I'm interested in anything I can learn about this combination.
Alas, the otherwise excellent local camera store does not carry the tubes, so I am hoping to benefit from the experience of others in considering the question
.