Wow you guys really know how to break a man's mood...
Anyways, just got an email from them saying it's on its way and might even get to me in Tokyo by Friday. If so, I'll have a review back to you about early next week.
And taking all what was said above into account, if the accuracy is decent and it isn't as prone to failure as some of you said from the fact that it's feeding the phone through the audio jack, I'll be happy with it. My rangefinder camera is smallish and I am comfortable with it hanging around my neck all day. If this means I won't have to lug another piece of equipment, the 129USD is worth it for me.
The Sekonic meter which I have cost me 30USD at the local store and it's doing a perfect job but it's still an extra piece. Having a bag on me like I do on workdays, I don't mind having it. On a saturday going from pub to pub with the guys and shooting around, I'll be happy with the LuMu hanging on a neck strap as thin as a fishing wire.
It all boils down to it's performance I think, so let's see. I've preloaded the App and it seems to have some settings for calibration (which creeps me out having read some of your above comments). Time will tell.
I'll post back.
Ben