We have currently reviewed 2 Monoprice headphones. They're a big electronics retailer that also produces their own headphone line.
Overall, Monoprice is a big electronics retailer that makes a wide variety of affordable headphones. They offer a lot of features for their budget price and even have some pricier, higher-end models with better audio reproduction, which can compete with some of the more known brands in audio. However, the headphones we've tested so far did not have the best performance regarding isolation and they were also a bit plasticky.
The best Monoprice headphones for audio quality are the Monoprice 110010 Hi-Fi Active Noise Cancelling. While the Monoprice 10799 Enhanced Active Noise Cancelling Earphones have better isolation and mixed usage performance overall, they're difficult to find or discontinued in most places. However, if you want the best sounding Monoprice headphones that we've tested so far, these are a great choice. They're not the most comfortable, but they have a decently well-balanced audio reproduction; they're lightweight and isolate enough for commuting.
Monoprice makes a wide variety of affordable headphones. They have cheap wireless and noise cancelling models, but their Monolith lineup, especially, offers planar magnetic headphones at a lower cost than most of the competition. They also have a lot of headphone types, so you can find what best suits your use and preference. However, the headphones we've reviewed so far from Monoprice don't have the best build quality, and their isolation performance has been a bit inconsistent from model to model.
Check our recommendations for the best noise cancelling headphones.