Difficult to say much but I use this for standard tuning with my 4 string bass's and it works accurately, quickly and silently. I know some tuners struggle to accurately work with bass, but this one doesn't. The display is nice and clear and despite being made of plastic, it feels pretty weighty and robust and it also has a nice positive on/off action. The sockets all feel decent quality, though I won't be plugging and un-plugging on my board a lot. It's in front of seven other pedals on my board (powered by an Engl power tap) and when not in use it doesn't colour the sound or change the volume at all. I only use this for tuning bass but it has the option to tune other instruments and although I haven't tested this, I have no doubt it will work well for those too as bass is the instrument that most tuners are likely to struggle with.
I waited six weeks for this to come back in stock, and when I placed the order it arrived in just three days. I'm glad I didn't impatiently order a more expensive make. I have quite a few Behringer pedals now and in general they work exactly as pedals should. They are excellent quality for money. If you can see past the plastic cases, they are actually incredibly strongly built and have proven themselves to happily stand up to a rough gigging environment.
All in all I am over the moon, this is an outstanding tuner at an unbeatable price. Why would you pay more? Highly recommended.