You should post some screen grabs of the different magnifications. I know a few people here, including me, have wanted to see how much closer lenses like yours can get you.
The CUs (which I call Diopters) shift the focus range closer as one would expect and the reason I purchased them. I shoot a lot of tabletop food/products and often find I need focus to start a few inches closer than they do (without using the wide end of the lens)
The #1 Diopter is perfect for this and likely the only lens I need from the kit of 3 Diopters (1,2,4) and 1 x Macro lens
The 10x MACRO can get extremely close and easily fill the frame with the whorl in a fingerprint or a match head. I will probably never use it but will try and find a "image trick" with it.
I bought the same ones. was only 30 bucks. I wil shoot some tests when I get back to the states. My only reservations was that they were kind of stored in a dusty dirty place and I had to clean the packaging. but if they work. a lot beter price than the century versions.