Mine just came in yesterday! I got the clearance sale at http://www.lendmeurears.com/product_info.php?products_id=54
Sure it took two weeks to get here from Singapore but it was worth it. I paid roughly the same for these as my AT-M50s (probably 15 more for the GR07 BE) and these are in a competition for what I listen to while traveling.
I have not really owned very many quality IEMs, the Klipsch S4i being the only decent ones Ive ever owned. I will say though that these blow the Klipschs out of the water and are less than twice as expensive.
My main comparison is between M50s and the GR-07 BE, I would say that they are relatively similar but initially it seems as though the GR-07 BEs are winning across the board, not by much, but they have more isolation, better perceived bass response and even a more enjoyable sound stage as far as I am concerned. The M50s are more sibliant than the GR-07 BE at least from what I can tell so far. Comfort wise is kind of a toss up but Id probably take the IEMs.
All of that being said...I still prefer to listen to my AKG k702 anniversary's more than either.
I was doing all of my listening out of my Fostex HP-P1, so perhaps it is just a much better match to the GR-07 BE than the M50s...