I've had these for about a week. I was coming from the Jaybird X3s.
I am going back to the X3s, and I'm sending these back to V-Moda.
The sound on these is amazing, but the ergonomics are not. First, I cannot get them to fit. The problem is the fins, which I rely on heavily with my X3s. The fins cannot be adjusted laterally around the ear buds, they are locked into place because they are a cap on the ear buds. I have to twist the finds on my X3s to get just the right fit, and I cannot do that here with the Metallos. I concede, however, that my ears are weird. I always have problems getting a good fit in my right ear with IEMs. It has something to do with my ear canal size or shape.
But there are other issues. The neck bar ("traplock" technology) is a problem. These are being marketed as sports IEMs, but they do not work well in weight lifting. The neck bar is sensitive to my chin / head tilt. If I tilt my head up too far, the neck bar falls off down my back, and pulls the ear buds out of my ear and I lose the fit that I worked on for a while when I put them on. I find that my chin tilts up in some activities, like pull ups. Perhaps that is bad form, but nevertheless it happens and it is annoying. Also, forget about doing lifts that require you to be flat on your back, like bench presses. The neck bar falls off and pulls the earbuds out.
Also, the wires from the neck bar to the ear buds are too long. Oddly, this is one of the reasons I bought them. My X3s tend to drift toward the side with the battery unit / controller and it pulls on my left ear. I saw that the wires on the Forza Metallos were long enough that this wouldn't happen (plus, the neck bar, in optimal conditions, stays in place on your neck and keeps perfect wire balance between the two buds). However, the wires are just too long here. When I am eating with them on, the wires get in front of my mouth when I am hunched over eating (probably terrible posture). Very annoying. Also, the wires are so long and thin that they easily get tangled up.
Finally, I generally do not like the neck bar design. I've never had bluetooth IEMs that have a neck bar. I don't like it at all. I can't easily throw them in my pocket, and they don't compress down as much as my X3s because of the bar. These might be the best neck bar wireless IEMs on the market, but I have decided I don't like the neck bar design at all.
On the positive, the sound is fantastic out of the box, noticeably better than the X3s. (However, I can get the X3s to sound almost as good using the My Sound app.) Also, the battery life seems wonderful. I did not test them to failure, but I listened for hours and never got the "low battery" signal. One more thing: I love that the power button turns the headphones on and off immediately. It seems like a small thing, but I HATE that I have to hold my X3s' power button down for a few seconds to get it to shut off. Computers and the internet have made me a very impatient person. I hate waiting for even a few seconds. The Metallo's power button is instantaneous.