Summary: Along with the summary below, I have posted a Youtube video review of the UE4000. If you like the video, check out my channel for more reviews :)
The UE4000, like all the new Logitech UE headphones, has some really nice build quality for the price.
Pros: Great build quality, comfortable design, 3.5mm detachable cable
Cons: Congested sound quality, doesn't fold up, earpads not replaceable
Summary: Without any introduction, here I will start:
Comfort: I wear glasses & I have no problem wearing these! It does get warm after sometime. Clamping force are not too strong.
Isolation: Isolates plenty of outside noise.
Build quality: Mostly plastic.
Sound: HEH HEH! Best on-ear headphone I ever tried.
Pros: Excellent overall audio quality for it's price! Excellent comfort for a pair of on-ear canes
Summary: *past owner of: Beyerdynamic T 51i, V-sonic VSD3, UE 500, Klipsch s4a
composition is a delicate balance of plastic and metal. headband slider adjustment is brushed metal. Ball-bearing type tilting mechanism for ear cups. The pleather earcups are acceptable quality and feel refined.
Summary: These days, for $40, there's just not too many good choices out there.
I feel the UE4000 should be a role-model for all the companies wanting to win this market.
First of all, this headphone has an amazing set of features for $40 which includes a detachable cable (super rare), not fully plastic...
Pros: Good isolation, solid build, portable form factor, great for outdoor use, bunch of accessories, detachable cable
Cons: Overwhelming bass, lacks detail and clarity, pouch feels thin, can be uncomfortable after a while
Summary: These headphones seem to have a large disparity in reviews with people saying they're either too bright or too dark. They're very different from the UE 6000 which to me were very very dark. At first they sounded muffled but with a good balanced sound.
Pros: Good mids and treble
Cons: very bass light, not very comfortable for longer listening
Summary: i've had these for a while and use them pretty much exclusively when commuting. i'll occasionally have them on while working if i forget my better headphones but they get painful fast so it never lasts long.
Pros: sleek, cheap, awesome cable, clear sound
Cons: uncomfortable cup pads and headband, flimsy adjustment track, lack of detail, very fatiguing
Summary: Accessories: Includes a pouch and cable. Pouch is well-built, compact, and stylish. Soft, flexible cable has never tangled for me in my time with it. Right angled jack is durable and well-relieved. Remote is a little plasticky, but works well.
Pros: Fun sound, no bass bleed, outstanding build, incredibly low price, comfortable
Cons: Not crisp enough highs for some, adjustable headband can expand accidentally