There is a learning curve with the Voloom. There are many "How-To" vids out there to see how it's done. The Voloom is a very popular tool and I think it's great that the Q finally brought it here.
FYI about the sizes...
The 1" and 1.5" have slightly larger nubs than the 3/4". The 3/4" inch is made to get closest to the root and is more useful for shorter hair. The other two larger ones can be used on the roots, too, but are better for longer hair.
If you go to the Voloom dot com website, there are vids there to see how to style your hair with the tool.
One of things I like about my Voloom is that, since I have an oily scalp, I can use the Voloom to lift my hair up off of my oily scalp so my hair doesn't get oily so fast. I can extend my hairstyle for a couple more days that way.