First impressions:
- It's thin. On the product photos it looks much thicker, maybe 1.5mm. In fact, it's 0.6 mm thick, just a little bit more than Rock'n'Ruler.
- The edges are not smooth. I had to file them carefully before I dared to put it on the frets of my guitar.
Usage:
After polishing it a bit, I used it on my bass to locate popped frets and fix them. It worked well, did what it should. So the thickness wasn't an issue after all, but I expected to see and feel a different tool.
Conclusions:
It's a useful tool to check your frets quickly, it does the job. But I feel it doesn't stand up to the proud names of Warwick and Framus engraved on it.