A great set of high-fidelity headphones should last you a decade. If you are buying these to truly hear your music or get lost in your work, you want to buy a pair that lasts instead of replacing cheap plastic every two years.
The trick to saving on these premium rigs is watching the release calendar. When brands drop their newest flagship models, last year's perfectly excellent version usually goes on sale. We can pair that timing with a smart payment plan to make the cost manageable.
Keep in mind that the 18-month window is a strict deadline, not free money. If you still have a balance when those 18 months are up, the standard high interest rate kicks in on whatever is left, which completely ruins the point of the plan.