Perfect little device and out of all the MIDI to USB devices I tried, the only one that works properly. Things to be aware of are that the cheaper devices only handle very basic MIDI messages, fail when there are lots of notes being played or just don't work properly at all (e.g. the cheaper ones do not work with Mac).
This worked straight out of the box, plugged it in to the keyboard (remember, you need the MIDI IN on the cable to go to the MIDI OUT of the keyboard and vice versa) and it showed up on the Mac. Fired up my MIDI programs and all was working perfectly. No drivers or fiddling required.
Very recommended! I've been looking for a reasonably priced but fully effective MIDI to USB solution which works with Mac (Mountain Lion here, so the latest OS X release) and all worked perfectly.