Dings good for multi-use trail, not traffic. My compass is off by about 120 degrees and is slow to respond so I have to bike straight for 30-40 seconds before looking at it and then do geometry to figure out which way I am going.
I really like this bell I bought a couple and already had several on other bikes. Simple, Inexpensive and a nice little compass. Not like I really use the compass that often in this day and age of GPS enabled phones.
Construction is solid, bell works great, and the compass works well except that it is 180 degrees from where it should be. My guess is that the magnet was installed in the float backwards. As long as you know this, and make the correction, you can determine your direction.