Per DB post, he got O-E-M - pair for $200 shipped which for another 60, I'd be inclined to head down this route.

Some ? need verification, more homework
- quality of 3rd party shell. I suppose not as weather resistent is OE
- quality of circuit board - longevity (I suppose too early to tell)
-- Price difference per Deans post, versus pricing on 3rd party on their site

$200 for 2 master remotes for a car that will be sold within the next 12-14 months, is more appealing than $140 for 1, IF the deal can be done at 2 Benji's.

While the flip key is different than what came with the car, the diamond key seems like the way to go . Less BULK. If this was a comfort access key, than the fob would be the obvious route. Have ya'll seen the Lexus CA key. Years ahead of BMW in terms of size...

Anyhow, any compelling X Outposter reason to re-consider the flip key.
Even if I go this route, I'd go the all plastic. Less Bl1ng than their other heavy duty chrome/plastic shell