These are from a line of Chinese OEMs, better known as Sivga SV006.
There's not much on the V006 but the others have been pretty thoroughly reviewed almost universally positive.
https://www.youtube.com/watch?v=nSkHbM8rKRA
Probably a good value.
SureSh0tThe BossHifi B8 looks like the SV006, but they are not the same headphone. The B8 has a larger sound-stage, more neutral sound (less bass, less treble), a longer headband, and less head-clamp. As long as you'll be using the B8 in a home environment, I recommend replacing their congested-sounding, not-big-enough, stock pads with Brainwavz' XL MicroSuede Pads... or Perforated Pleather for a larger soundstage and less bass. The XL pads are a bit big for the cups... but substantially improve the headphones' sound. For on-the-go, Brainwavz' standard pleather pads will do, but their 'Perforated Pleather made for Sony MFR-7506' make the B8 sound more cohesive and natural.
SureSh0tMy updated Brainwavz ear pad (oval) recommendations for the BossHifi B8:
Micro Suede Pads (most cohesive sound, most comfortable)
Sheepskin Leather (most bass and tames the treble)
Suede Leather (haven't heard yet, but I expect they would be more breathable with slightly less bass than the sheepskin pads)
Brainwavz' standard protein leather are the least expensive option and sound quite good with the B8... but are the least breathable.