It has a nice and quite powerful tone. It's easy to use thanks to the nozzles to blow into.
It could be a bit more accurate though. The low E is -11 cents on my copy and two more more was like +-7-8 cents. The rest of the notes are within +-5 cent. So worst case there would be almost a 20 cent difference between notes if you used it to tune an instrument. That would definitely be noticeable.
I actually have a pitch pipe that I bought on ebay for 10% of the cost that is more accurate. It has a weaker tone though.
For my use, as a start pitch for an a capella group it's not that much of a problem with the accuracy.