Its small, its light, and functions well. Put MIDI in, get x5 MIDI out. Everything is clearly labeled, hard to see how you could go wrong really.
Although the case is not in any way flimsy, I wouldn't want to put it anywhere where it could get trodden on (e.g. on the floor). Plenty good enough for mounting inside a rack or under a pedalboard, though. Its also very light, so you can velco it somewhere safe.
One word of caution for Guitarists: The power connector on this unit is 9v Centre-Positive. Most guitar pedals are 9v Centre-Negative. If you intend to use this on a pedalboard, you need to be careful with your power cables.