Be sure that your machine bed is totally flat for this to work. I had a Bernina and it had a bit of a slope on the machine bed and the halo didn't sit on the entire surface so it didn't work.
On one of my other online groups one of the very prolific quilters says she likes it for very close stippling and filler, what she calls 'nose to needle' quilting.
I have not used it yet on my new machine, I do like using the Machingers brand of gloves.