Pros: Gigantic soundstage, crystal clear treble, detailed, airy sound, comfort, extreme value for the small price
Cons: Bulky as hell, needs a warm amp to sound right, not for bassheads
I bought my pair as used, so I have no idea how long burn-in period is needed. These are almost fully open cans with an enormous soundstage - even the Sennheiser HD-650 cannot beat the Takstar in this aspect. There is not much bass, but the bass quality is very nice, tight and controlled. The midrange is greatly detailed, but the real magic is the crystal clear, sparkling treble. Acoustic instruments, guitars, violins, piano, drums and cymbals are a real pleasure to listen to. These neutral to bright sounding cans are not for bassheads for sure, and they greatly benefit paired with a warm, dark sounding DAC/AMP. I used mine with a FiiO E10 (bass extension ON) and a Pioneer PD-DM802 CD-player. The impedance is 120 ohm, but the TS-671 is a very sensitive device, so amping is not necessary. The comfort is great, the pads are from velour, the clamping force is not strong at all, so good for long listening periods. I think I never saw a headphone so big like this, quite silly looking, but at home who cares? :) The overall value is extreme, the TS-671 easily beats headphones that cost 5x of its price.
So if you want quality sound for home listening for only 50-60 bucks, stop searching and buy it. You won't regret it.