I also recently picked these up on a semi-whim at Micro Center for $79. Definitely sound great for that price!!
Difference between filters is subtle. I've only tried the Reference and Treble filters. Maybe Treble tones down the mid-bass some? Maybe? And maybe there's a bit more treble presence? Maybe? I've not tried the Bass filters yet and probably won't, as they're already borderline too bassy for me.
Overall, I guess I wouldn't really describe the sound as being V-shaped, although there's definitely a lot of bass emphasis. To me, "V-shaped" means the mids would sound recessed, which is not the case here. I actually find the mids to be pretty well forward. If anything, to me they sound like a reference tuning with extra bass. Maybe with the Treble filter it's more U-shaped.
Soundwise, the only thing I don't like is that the mid-bass is not only big, but sometimes a bit overwhelming and uncontrolled and seems to impinge on the mids.
Ironically, I find the Comfort Fit Comply to be the most uncomfortable. I generally don't like silicone tips, but I find these ones to be much more comfy for me. They also tame the bass slightly. The drawback being that they don't isolate nearly so well. I happen to also have some Comply T-400, which... well, to be honest I got sick of comparing, so haven't listened critically to them yet, but they're more comfortable than the included Comply.
I'm a little concerned about the cable, as there seems to be a small amount of crinkling on the memory wire area already. It doesn't look like Micro Center is a certified RHA retailer, in which case the 3 year warranty won't apply. I'll have to double check that with RHA. If that's the case, I may end up returning them. On the other hand, I find the cable mods people have done to be highly intriguing and wouldn't consider screwing up $80 headphones to be the end of the world.