But see, I don't really feel certain my tastes are sophisticated enough to want something like GR07; I'm afraid it would be boring compared to my more colored headphones. I was even going to low-ball my desire for the SM3 and go to the SM2. I was really impressed by my Shure SE215, in both mids and bass; the bass can be slightly muddy sometimes and the mids are missing minor details but overall I found them very likeable, whereas I've seen quite a few people who might be more "true audiophiles" express their distaste for the overall SQ of the SE215; to me, it needs more detail in the treble and tightness in the bass, but other than that it's perfect for my ears. Micro-detail in the mids would not be missed if the price was right and everything else was there. Likewise I have a pair of Phiaton MS400 which I feel lack very little with the exception of occasional sibilance and a bit of muddiness in the bass. I worry that phones like the GR07 will be too neutral for me and lack the overall quantity of bass that I want.
I'm looking at aurisonics now, which are also said to be neutral-sounding, but only because they are apparently a steal at the current price considering overall SQ, and will likely have the bass and isolation I need.
I still say give it a shot. If you don't like it, there'll be plenty of folks willing to snatch it up on the FS forums. I honestly think they're one of the best values in the iem world. I don't mean to call names, but if you notice ericp10's inventory, he's only keeping his ASG-1, 1964-Q, and GR07. He's selling everything else. I think that may offer some clue as to the high esteem he holds them in. I don't think you'll be disappointed if you get them because I haven't heard any iems that compete with it as a total package.