Good audio makes the TV experience. If you buy a cheap bar now, you will likely replace it in two years when the dialogue sounds thin or the bass feels weak. We want to buy a setup with a dedicated wireless subwoofer once so it lasts a decade. This gives you that movie theater rumble that built-in speakers can't touch.
New tech models usually launch in the spring. Buying the week before the Super Bowl is the smartest move because retailers drop prices on last year's flagship models to clear out the warehouse. You get the premium build and better materials for a mid-range price.
This 0% period is a strictly timed window, not free money. If you still have a balance after those 15 months, the standard interest rate will apply to the remaining amount. That rate is typically high, so make sure the bar is fully paid off before the clock runs out.