It works, but it is a bit on the cheap side. No good solution for spool sizes and screws are in the way of labels on 25mm spools.
The side guides are no flat/parallell due to how they are fastened. And it is a bit on the noisy side.
But all in all it does what it is supposed to. And the tension arm reacts and pauses the spooling when the label printer does not keep up. I have used it in-line with a label printer as low speed. Performs flawlessly.
Would guess that the higher speeds are mainly for manual spooling. This works well too.
Excellent value for the money.
I paid just under 1200 SEK ($120).