Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good sound, limited useability

Terrific clear, detailed sound without the overwhelming boomy bass, as should be for $100. Had this for about 3 years now - no problems (except what I'll describe later), still sounds great. Won't do if noise isolation is critical or for active use outdoors - too big to wear or carry for anything but stationary use. The foam covers are deteriorated and I need to replace them. Now, here's the problem - it's odd shaped (square) and only OB sells replacement foams. It's $11 PLUS $12 for shipping - sorry but that's ridiculous. I'm going to pay a few bucks more and try a new Koss Portopro instead.So, given the initial cost AND maintenance cost afterwards - don't buy this sucker, although I enjoyed having it.