As said above. It is a well constructed product, there is no doubt about that. You can unscrew the 6.35 mm jack cover to look into its guts and see a well-done soldering job.
The only thing I do not like is that they sell it separately from the primary product. And unless you just want to imagine how it sounds you will need to plug this thing in and pay the exaggerated price.
So, it's good but expensive.