I just bought some today on sale at The Source.
I'll post some of my terrible impressions in a bit. I just suck at describing stuff, so it likely won't be accurate.
Okay, I've done some really brief listening to it, and this is what I've got:
Bass is good. Maybe a little too much mid-bass, but it's hard to tell. I'm actually really impressed with the amount/quality of sub-bass. Oh yeah, and it gets into the mids a bit too, but no biggie. Unlike you, I liked the Monster's bass quite a bit more here. I don't know why, it's just nicer.
Mids, I actually have no idea how to judge mids. They aren't any too forward, that's for sure.
Treble seems brighter than on my MTPGs, and a little bit sibilant. Not bad at all, but I definitely prefer the more laid-back Monsters.
Comfort-wise, the Monster work much better for me. Something about the straight nozzle thingy I guess, just goes in easier. Isolation is considerably better with the Monsters.
Overall, for the price, I love them. The signature is really to my liking, and for $20, I don't have any complaints. Also, they helped me realize how great the Turbine Golds are. It's like they were made for me. Nothing against the JVCs, I mean, the Turbines cost me like 15x more, so they should be a heck of a lot better, which they are. One guy's opinion.
And after a quick head-to-head, the FX67s seem like the sound is a little "masked."
It really sounds like I'm complaining about it, but I think what I'm saying is just little technicalities. Is the sound better in the Monsters? Heck yeah. Do the Monsters warrant a price tag $300 more than the JVCs? Not likely.