The NAD VISO HP50 are good critical listening headphones with a unique look and a decently durable design. They have a well-balanced sound and a stable fit good enough for sports, but they're a bit too tight on some heads. They also don't block a lot of noise so they won't be the ideal headphones to use on loud, noisy commutes. On the upside, they don't leak much.
The NAD VISO HP50 are good for neutral listening. They have a well-balanced sound that packs a good amount of bass without drowning the instrumentals and vocals in the mid-range. Their treble frequencies are a little recessed, and the bump in high-bass/low-mid makes their sound feel slightly muddy and boxy overall. They also have a limited soundstage due to their closed-back design, but overall they should sound good enough for most listeners even the more neutral ones. Unfortunately, their tight fit may not be comfortable for very long listening sessions.