It works just fine, and is pretty simple to use with some practise. The main complaint I have with it is the lack of variety of time signatures, Out of 121 beats, there are no 3/4 times apart from the one in the metronome. The little manual claims there is a 3/4 time in RnB, but it ain't there..All the others are 4/4, with a couple of 6/8s.
Was just looking for a drum sound metronome, something to jam along with, at this price point my expectation was not that high. however i love this unit, the drums sounds are great, as are the patterns and rhythms. Also it has no hum and operates with no pops or clicks.
I now use this unit all the time and has improved my playing.