I purchased the Cobalt HF3 version for around £110 under two years ago and they have been great since day 1. They have been through everything with me and naturally through vigorous usage the cable split near the inserts which made the sound cut out in the right channel.
I sent them off for warranty repairs to Etymotic last week (warranty lasts 2 years) and they arrived today. I received a brand new Black HF3 headphones (apparently the other colours are discontinued) and I could not praise Etymotic customer service any more. Once these new pair of headphones die out then I will follow Etymotic's out of warranty program and upgrade to the ER-4 headphones.
Just wanted to add an anecdote on my experience with these headphones and Etymotic service.