the MXR micro amp is a handy piece of kit.
mine arrived very well packaged in a good quality black box. once unpacked i found a very high quality pedal, the case is made of thick metal, the dial is good quality as is the switch.
its designed to boost your signal, but you can use it for way more than that, on large pedal boards, it helps keep your signal strength high. you can also use it to make yourself louder at a drop of a hat, and you can also add a bit of grind when you turn the gain switch to the max
i personally use it to make myself louder on stage when going into a heavy chorus.
being able to ramp up the sound level really helps to get the fans attention. and having the power to change your volume level without the sound guy makes life so much easier.
if you were to get just one pedal, this is the one i'd recommend, its simple, its incredibly diverse in its use, and the quality is a cut above all my other pedals.