Shark does not have authorized service centers. You send vacuums back to them for repair, at your cost, whether it's for warranty service or not. Best Buy associates told me that under their extended warranty, they will handle warranty issues, whether they send the unit back for repair, or they just give you a new, same or comparable model if yours is not available. It's hassle free on the customers end. In addition, the BB warranty extends two or four years past the mfgr warranty. The four year warranty is an extra $5 above the two year warranty: Definitely worth it.