Nice but you get one sound
3.0 because "really good," but not "Great." :-)
* Convenient use compared to the amplug I've been using for a few years now. I bought these because my new MTD bass has a recessed cable jack in which the amplug barely fits, and then only in an awkward position that exposes the headphone plug to repeated banging on anything I brush up against (which then causes some loud bad noises in the headphones - not fun). The amPhone cable plugs straight in and is much cleaner.
* Compressor is cool.
* AUX input is out of the way and works well (as does the same on the amPlug).
* Headphone quality seems pretty good.
* My only complaint is that the amp sound is limited to a "scooped" EQ. Many players are surely going to like that, and it's nice for slapping, but it's not always to my taste. In particular, this EQ doesn't cut through as well when playing along with recordings, but sounds pretty woofy. I can EQ some mids back in on the instrument, but in general it doesn't sound as good to me as the amPlug. It would be great to have a real EQ on the amPhones, or even 2 or 3 selections in amp modeling.
In any case, I'll get used to it and will be using the amPhones because they are way easier to use that the amPlug and don't leave stuff sticking out for bumping on a countertop or something.