I didn't vote but contrary to the others, I have the M80s but not a sub, LOL! I find the M80s to have a very good bass on their own for most music. IMO, it all depends on what you're looking for and what you're listening to. For rock music, if you are looking for "chest pounding" bass drum, you might want to add a sub, if you are looking for less pronounces but maybe more accurate bass, you might very well find that the M80s do an excellent job. In the end, you will need to try both scenarios and see for yourself if it is worth it for you to spend the extra $$$.
