Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not for Bass Boosters

I would not recommend E2C's for people who prefer the Boom in their ear. Although really great response for High and Mid range frequencies, its the Low that is the killer. My Sony Fontopia (EX51) sounded better in Lows and its only 1/3rd price. The sound isolation was pretty good though. Another aspect was the lack of labeling on the sides, instead it is color coded. You have to remember which color goes where. But I guess you can get used to that. Overall my opinion is - I returned mine after a week of use.