Summary: Just wanted to make some comments on the CAD MH310 - a rebranded Superlux HD662F. I will be referring to them as HD662F for the remainder of whatever this is im writing to avoid confusion . I bought a pair Superlux HD681 at the same time and will just compare the two, along with a few others.
Pros: Good sound quality, decent soundstage, separation, layering, easy to drive
Cons: Clamping force (easily remedied), treble not for everyone
Summary: Construction and comfort
Clamping force is rather tight, but not uncomfortably so. It's possible to adjust the force simply by carefully bending the two metal bands keeping other parts together.
Pros: General sound quality, flat frequency response, open soundstage, price
Summary: I was reading a lot of stellar reviews on CAD products online -- not necessarily that they are top-notch performers but that they are an excellent value. Owning one of their microphones, I was intrigued when I ventured onto their site and saw that CAD has some headphone offerings as well.
Pros: Good price/performance; cheap; clear and overall well-balanced