The make up of the Boss LM-2 pedal is really easy to follow and figure out as it simply has four different parameters. From left to right it has knobs for level, tone, release, and threshold. It is extremely easy to use this pedal and to get the tones that you are after in a hurry. Like most Boss pedal there isn't anything complex about this pedal and it shouldn't take users too long to learn everything about this pedal. I don't have the manual for the Boss LM-2 so I don't know how well put together it is, but it really isn't necessary as the pedal is very easy to use.
The sound of the Boss LM-2 is extremely clean and warm sounding overall. The sustain that can be gotten with this pedal is the best part of it in my opinion, as it can last for days if you set it right. I use this pedal with either a Fender Strat or a Gibson SG plugged into a '76 Fender Twin Reverb amplifier and I find that I can get some pretty awesome tones with this configuration. I've never used the pedal with anything besides guitar, but it would probably work fine with any other type of electronic instrument.
I've been using the Boss LM-2 for about three or four years and I can't understand why Boss would discontinue this pedal. It has a killer tone and is pretty versatile for a limiter/compressor pedal. Not only is it perfect for sustain, it also can provide a nice deal of crunch or can simply be used as a strict limiter. Since they no longer make this pedal, it is somewhat rare and the prices can vary, but if you are into vintage Boss pedals this is a must add to the collection. Overall, the Boss LM-2 is an awesome limiter pedal that is a must try for those who love the Boss collection.