Just thought I'd give a brief update on my GR07s. Still loving them! LOL ... I find that they are kind of like chameleon's, they can sound truly incredible on certain recordings, as well as pretty mediocre on bad recordings. I find myself being drawn to quality recordings, and paying more attention to the recording than with my previous IEMs. When these shine, it's really a great experience. The balance is so subtle but so clear at the same time, it really points out how "colored" other IEMs are.
Still loving the bass on these. The lack of mid-bass and the sub-bass presence, combined with a solid midrange and slightly forward (to my ears) high end, makes for a nearly perfect combination. Sometimes I feel them straining on contemporary recordings (esp. electro-pop stuff like M83, when synth and voice combine sometimes the vocals seem strained) but I can't be sure if this is the recording or the phones.
I have to agree with the chorus that drums do, for some reason, sound really really good on these. The timbre/tone is just right, very snappy. Cymbals have great energy and presence.
I'm not sure if I'm getting a great seal w/ supplied tips. I didnt receive the double flange tips when i bought mine through amazing, so im using the biggest silicone tips provided but i think they are too small. I've ordered some Comply T400s and I plan to trim them to prevent muffling. I'm going to order the RE0 bi-flange and maybe even the Jays tips too just so I can have some options. I hope I can get a deep seal.
Springy cable is annoying and tends to pop out from behind ear, but I find that if I cinch the cords under my chin they tend to stay in place.
Probably have close to 100 hours on these, cant say i notice much difference, maybe a wider soundstage and smoother sound overall. Sibilance never bothered me with these, not sure what to think about that!