Couple of points from the review:
- Poor battery life. The review reported 30 minutes of use per 2 batteries. I'm not sure if the batteries that power the thread mechanism also power the watch.
- It says you must use Mesika Spider Thread. I think the reviewer may mean that you must use the spool that Mesika thread come on...the spool that goes into the Spider Pen Pro and Tarantula.
One interesting point is that you can - with an included small screwdriver - adjust how quickly the reel takes up the thread.