Getting to the OP's question, you can tell the Les Paul owner that L100's are exactly the same as 4311's - The consumer version just hid the L-pads behind the grill for aesthetic reasons. If he's working/listening in mostly analog formats, they might work fine. Many great recordings were tracked and mixed on them.
wow. quoted for posterity.
the single greatest across the board rule in pro audio and studio work is TO NOT MIX ,MASTER OR TRACK on home audio and consumer speakers because of enhanced frequency curves.
this is a known fact.industry wide.
AGAIN lol :
monitors= designed for flat freq response for accurate mixing and mastering
homeaudio speakers= playback devices with pleasing curvs on the low and high end frequencies for nice sounding playback for the home listener.
Sorry, I totally disagree with this. If this were true, we'd only need one type/brand of monitor, and every engineer would use it. And every mix would sound good. (or at least "accurate")
Others have pointed out the reality of the situation - But I'll try to summarize. "Control" or "Reference" or ""Tracking" monitors are usually used to record, balance and evaluate what's being put on tape(or other media) , edited, overdubbed, or punched in. As mentioned, they need to deliver/withstand high SPL's and dynamics, and brutally evaluate sounds before they are committed to. Certainly they have a role in playback and mixing, but generally the modern trend is to use separate mixdown monitors, often near- or mid-field. These HAVE to be voiced in a similar fashion to consumer hi-fi, so that mixes "translate" to the final listener.
Mixdown monitors have an inverse relationship to the final playback system, which is why flawed monitors like NS-10's, Mackies and others work so WELL. As mentioned, the painful mid spike in NS-10's will cause a mixdown engineer to back down the mids a little, resulting in a more open, less cluttered sounding mix for many listeners. That said, they still need to sound good with a wide variety of sources.(Which is why I always disliked NS-10's in all their iterations). I would never consider a pair of mixdown monitors or nearfields which weren't good for home listening. And many engineers use a variety of home hi-fi speakers for mixing and evaluation - look around.
Actually, the first across the board rule in pro audio/ recording is, "never use more than one mic". The second rule is "always ignore rule one".