I received my gr07 (Bass Edition) this weekend (with Rock-it R-50) and wanna share my impressions.
First of all why BE? I guess I just like the cable, looks pretty cool, besides it's excellent cable if You ask me- smooth and soft, not carry any noise.
Build quality? Compared to r-50 they really feel lot stronger and can't find anything that could break over time (maybe cable will go fade).
Was surprised how pleasant sound is just out of the box, they are not bass heavy (not as my brothers Meelec CW31) and quite forgiving poor mp3 quality (opposite to r-50).
Fit? Many people complain they can't get good fit/isolation with stock tips (even if it's generous tips collection) and... I do too T_T. None of stock tips seams to give me good isolation and can't find good nozzle angle for me, best isolation I get is with Hybrids (besides stock tips are hard to put on the nozzle). My r-50 gives me good seal just out of the box with tips on them but gr07 are really tricky here.
Generally I'm happy with the purchase (never spend that much money on phones) and would be more happy if I could get good isolation.