Not tried those two, but I've tried the LM2, and own an F1. The F1 is definately snappier, more aggressive but still very flat. The LM2 is round and warm but with plenty of punch. I can make the F1 sound like the LM, but not tue other way round. The F series are smaller, and in my opinion look cooler. Plus you get more tonal options on the F500 with the parametric mids. Just depends on if the extras are worth the higher price tag to you.