Bose Quiet Comfort II
Needed Warranty Repair
Owned for 4 years, used Daily
Stress Points- Started turning on by itself, even when power switch was set to "off", sent in for replacement following this fault.
Ear pad material started splitting on one of the cups, replaced fairly easily with a replacement bought online. 
Positive Remarks- Used daily, with them being heavily used (5-8 hours a day, every day) since the pandemic started.
Battery life and noise cancellation did not degrade significantly
Incredibly comfortable, only headphones I've ever had that I could wear for that long.
Getting free replacement of the newer model (qc45) despite being well out of warranty. - Would you buy it again?
Yes