These have been a great pair for me.  Initially they seemed a bit expensive.  However, these have lasted for 2 years, and are still going strong.  They have exceptional sound quality and decent sound isolation.  They are quite comfortable for in-ears, more so than all others I've tried.  No problems with these so far and I expect them to last because they seem very durable.  They only thing lacking is a "big bass" but I'm not a fan of over-bearing bass anyway.  The reason for 4 stars is the price should be a bit lower and the bass a bit higher. 

Question: How is the sound quality?
Answer: They have exceptional sound quality and decent sound isolation