I like the BA200 more than the GR07 MKII. Currently, I'd peg it as my favorite universal IEM under $500. It's as close to possessing an HD600-like "seductive" midrange as I've heard in a universal IEM. The RE262 previously held this title for me.. but I find the BA200's midrange even better. The BA200s midrange separation and openness sounds more natural and lifelike, to my ears, than the GR07 MKII's midrange. The GR07 has a slightly more textured, natural bass response that quite round and full.. but the BA200 comes very close to that. The GR07's treble sound a bit uneven and harsh compared to the BA200's smoother, more linear treble.. even though it's laid back more than the GR07's treble.
What I like about the BA200's unique sound is the subtle, analog-inspired warmth combined with the slightly thin note weight. Don't mistake the 'thin note weight' as "thin sounding".. no way.. the BA200 has excellent dynamics & soundstage proportion. No "wall of sound"-type presentation here. This blend gives way to an airy, HD600-inspired midrange that's very inviting (though the BA200's mids are a little warmer than the HD600's mids). I haven't heard the SM3, but having read plenty of reviews about it, I sense it possesses a fairly high degree of note thickness that makes it unique (but, at times, not always ideal for some genres of music).
I like the smooth, laid back nature of the BA200's treble too.. plenty of detail.. but it's not in your face about it. I facilitates long term listening quite well. Run it through a clean, transparent portable amp (like the UHA-6S MKII) and you'll hear the treble detail, separation, and extension better.
Like you, I prefer the BA200 over the GR07, though I have the Bass Edition. The SM3 I feel is a different animal altogether. Mids are lush and full with just the right amount of body to avoid sounding nasal. But the BA200 does possess a lot of the SM3s strengths in mids, presentation and separation. The SM3 just does everything a little better. In fact a little too good.
In my mind If the perfect sound is pegged at 100, the BA200 comes close with a score of 90. While the SM3 overshoots at about 110. Both of them are about 10 pts away from being perfect. Higher scores doesnt necessarily mean better.
I still prefer the SM3 but the BA200 comes at a very close second, the GR07 just slightly behind the Ba200.
Again, everything I say is just according to my preference and how I hear them.
Edited by Annafrancesca - 1/9/13 at 2:32pm