[AV3Nguyen]

After having been recommended the HE-400i here, I decided to jump on a used pair for 300 USD. However, they don't have warranty (apart from a 7 day return/refund period). I'm afraid that they might break and then I'd have no warranty. I could wait for a new pair to go down to a similar price (they were 300 on amazon in january, but they charge tax unlike where I got my used pair), but if their build quality is sufficient, I'd rather take a low risk and have them early. I can return a DoA pair, but I'm worried about long term durability. Hifiman says that the pair are refurbished and were "used for photos, reviews, or tried by customers and then returned." Can I expect quality like my brother's DT 880 Pro's which are still working perfectly fine sound-wise 4 years after he purchased them? I don't intend on being abusive to them in any way plus are going to be for home use, but at the same time, I'm not going to carry it around like a king.
 
TLR: Got used HE-400i's w/ no warranty. Good enough quality that I don't need it?
 
Thanks!

 

[Feilong4]

I don't know about durability (which should be fine as long as you don't toss them), but longevity I think is a toss up. 
 
I just got mine about a few days ago so I can't comment all too much on longevity, but it should be fine as long you put some care into them like putting them back in a case or its box after use.