I bought them last week. I used them for a couple of days and then gave them away to a friend. For $30, I couldn't really complain about the sound. However the bass is way too overpowering for my tastes. For comparison, my regular iems are the Phonak Audeo Perfect Bass. Granted I didn't have the Sony's long enough to do extensive burn in, they did not sound nearly as good as the Phonak.
Everything sounds so much more refined and controlled. I ordered some black filters for the Phonaks and they came in around the same time as the Sony's. With the black filters, the Sony's are not even in the same league. Then again they're not in same price range so that may not be a fair comparison. I thought about keeping the Sony's as a backup but the cables are one of the worst I've seen on any headphones. And the original tips were uncomfortable for me to use for extended periods of time. I tried the hybrid tips. They worked better but the sound was a little bit worse.
I could see myself giving these away as gifts to friends who are using the stock earbuds that came with their phone/tablet/whatever. I can't imagine spending more than $50 based on the overall package but they're not bad at all for what they are.