I am really enjoying these. I purchased these to have a contrast with the FDX1 and they compliment them perfectly. Where the FDX1 is a very neutral sounding IEM, this is extremely warm and laid back. I don't get any sense of loss of detail compared the the FDX1, but the emphasis on the low end, total lack of harshness on the top end, and comfortable secure fit make these an excellent choice for just laying back (literally or figuratively) and relaxing to your favorite music.
GeneralLienAlready bought? If not, I may help you because I happen to own both of them. If I were in your situation, I would choose FW01. If you want reference sound with less fun and relex, then pick FDX1. If you are a person who like fun and relaxing sound, then go for FW01. You will not regret it.