I bought my Brother HL-5350DN laser printer almost 5 years ago. I've never paid attention to the number of pages I've printed, but it's very less.
The drum is supposed to last for 12k pages on average. My drum went bad suddenly a couple of days ago; there is a 2-inch wide vertical band of white in the middle of the printed page, plus other white patches. I inspected the drum and it was clear it was a goner; had marks like stripes in the non-printing portion. Cleaning didn't help.
Replacement drums are as rare as hen's teeth. Apparently the bastards install a lower life drum and cartridge for here than they put in the US. I had to call Brother support; fortunately they were open Saturday, and they gave me the number of their guy in my city, who further gave me the number of two authorized resellers that are a 1 hour ride away from me. The resellers' quotes: Original Brother drum replacement: ~ $95. The guy offered to replace the roller alone in my drum assembly for ~$17, which I opted for. He offered no warranty for the job, but claimed the original Brother drum also came with no warranty since it was a "wear & tear item" because paper and paper dust are abrasive.
I printed some pages with the refurbished drum, and output is fine as of now. I printed a status page, and surprise! I've to date only printed 4,237 pages! This sucketh big time; the life of Brother consumables is a rip-off, and their cost is too high. I'm on my first replacement toner cartridge. Street price for the toner is ~$70.
HP consumables were far cheaper, and I always liked the quality of HP laser output. Brother output is meh for text and horrible for anything beyond. Unfortunate that HP started expiring cartridges. Also, I wanted networking and duplexing, and Brother was the only sane choice available to me at that time. When the Brother dies, I'm going to buy a USB printer and hang it off the wireless router, and screw the duplexing. This will mean buying a new router, but it will far, far cheaper than buying a networkable printer.