I bought these just under a year ago, and had one of the bulbs flicker at about the eight month mark, and eventually die altogether after about 11. I tested it on my electronics workbench and it was giving off maybe 40 lumens with the cooling fan free to move but not activating at all at standard V/A that a car would feed it while running normally. I contacted customer support, but am not sure they'll even offer a replacement bulb, since they only offer a 90 day warranty, and one of their two support options hangs up during business hours.
UPDATE TO BOTH UPDATES ETC:
The full replacement set showed up on Thursday evening, and I've got the H11 installed, and have two backup 9005s and a backup H11 in case anything happens anytime soon.
I have to say, it was somewhat of an inconvenience to have a non-zero failure rate on the bulbs, but the customer service Rimthin provided was better than I could have predicted from a company I'd never researched and randomly bought from on Amazon.
UPDATE:
I received a call back from Rimthin customer support, and was informed they do have a 1 year warranty, which is separate from the 90 day return policy. I was told today to wait for one to two business days and I'll receive an email detailing updates on the shipping of the replacement I'll be receiving. For now I'll leave the review updated to 3 stars, and will update if I receive the email/replacement.
UPDATE PART TWO:
I got an email from customer service like I was told I would, sooner than I was supposed to expect. they wanted my order number and shipping address, so I responded with that. got a response in about 15 minutes and asking if I needed the h11 or the 9005. I let them know I needed the h11. since they were out of just the h11s and packages, they sent me another four pack. The tracker says it's going to show up tonight by 11:00.