I have one and really like it when I'm setting up a temporary ironing station next to my sewing machine for paper piecing, where I need to iron small amounts very often.
I have found that when I am chain piecing, the iron won't stay hot enough for me to get everything pressed. I have to keep putting it back into the cradle for a bit before I can press again. It does heat up pretty fast though., Part of the issue is that my ironing board is about 30" x 50" so I can lay out a lot of pieces at one time for ironing.
I'm glad I have it, but I know it wouldn't work for me as my main iron.