Tool seems well made, but I wouldn't call it a presision jewelery tool. However I had no difficulty finding the right size wrench tips to engauge the back case of my watch. I had the back off and battery changed in minutes.
The detents the tool fits into on the watch case are shallow, so the tool can slip out and scratch the watch, like I did, but if you used this tool often I don't think this would be a problem, something to be aware of though.
I've worked with hands tools for a long time (medical eq repair) and appreciate good tools, I'd buy this tool again.