Finally heard the UE 900 tonight. It's what the TF10 should have sounded like, but IMO it doesn't beat the W4. The W4 sounds more refined to my ears. The UE 900 will have to go back tomorrow. Again, it's quite an improvement over the TF10. If there's ever a sale and it goes as low as say $200, it will be worth having, but not at $400. The packaging is outstanding though. That's pretty much all I will say about them. I enjoy the W4 way more than the UE 900.
Good to know (if I ever decide to go really crazy on iem's lol!). Anyway, your avatar prompted me to throw on some Kind Of Blue on the xba3's. Sweet Prompted me to try the fxd70's with the album as well. Holy detail batman! Very cool.