Do you have personal experience with it? I tried to do my homework first, but could only find one lengthy review of the Phoenix hub (in Velovision) and that was quite complimentary. Apart from that I could just find "hear-say" on the web. An interesting snippet from the Velovision article is that Sturmey Archer have apparently constructed Phoenix in such a way that they relatively easily double the gears in the future - giving 16 speeds with a 610% range. Now that would be something!! (Wav: I hope I don't sound defensive; as I wrote I am impressed by the Phoenix and am happy that it does what I wanted. I'm just curious!)

The SRAM iMotion 9 speed does indeed look like a nice bit of kit. It's heavy though, I think the first version they will release weighs 2400 g with coaster brake (again, from Velovision). Contra the Sturmey, at 1400 g..