I like using the 414X toner cartridge because I get more value for my money. I do an exceptional amount of printing and rather than purchasing one toner that will only print 2200 pages, I purchase the X that 1) costs less than three individual cartridges combined and 2), I get more pages printed. This is the best deal because it saves dollars, and it makes sense.
The toner cartridge is designed to be easily installed and specifically for my printer. The cost is almost prohibitive, but third part, far less expensive products, which I have used successfully don't always work. So periodically I spend the hundreds of dollars more and go with the HP products. Again...way overpriced.