What's the sensitivity like? A moderately sensitive closed back with LFF's personal touch sounds like an ideal headphone for me right now.
@Tari - Don't have solid number to give, but a quick quote from an email from Luis:
"They are rather efficient. They sound really good out of an iPod touch 3g. One of the beta testers was blown away at how it sounded with his touch playing apple lossless with NO amp.
I currently have them connected to my Cavalli CTH. However, I'd probably recommend a Vali for them if you wanted to amp them."
I think it is safe to assume the sens is relatively high and these are easy to drive (although scales more than likely).