I would consider the ba200 an up-side-grade. :-P For me personally, the gr07 was too "all over the place" with the frequency response curve. A lot of mid bass, sibilant treble, no real high highs and hard to describe mids. The ba200 is fairly flat all around the spectrum with more of a downward curve on the high end giving what some people call a "warm" sound. I don't think they sound very warm. Warm from lack of the clearest highs, perhaps, but not warm in the "these make me feel cozy" way that even the pfe112 had. However, the ba200 pull out a lot of details, have no real flaws and just sound great.
So they are a sidestep, because overall they don't do anything a lot better than the gr07, but they are an upgrade because they eliminate the flaws of the gr07 with only a slight decrease in treble presence. This also seems to decreases when using an amp, and you get slightly more crisp treble. I personally can't get past some of the flaws that others can. I'm not even sure if i'm going to keep the ba200, but if I had to keep any, the gr07 would be one of the last on my list.
Don't take that as a negative review, but more of a description of the way they sound to me. A lot of people seem to like their sound signature, but I can say this, the ba200 are definitely more accurate overall, which translates to a better realism with strings, etc. Then again, some people like their strings to be "vivid". I like them to be realistic... Just my thoughts.
I couldn't have phrased it any better.
For me, in terms of overall sound quality, the GR07 is up there with the big boys, but terms of presentation, the BA200 pulls away from the GR07. The BA200 just sounds a lot more spacious.
I have both the GR07 and the BA200 and it works because I can switch between a highly resolving reference IEM for vocal tracks and classical music, and a very good stage monitor with low lows and high highs for more "fun" contemporary stuff. But just like Travelbug, I too am anticipating the GR08.