I was a little nervous about purchasing a refurbished vacuum but I used it as soon as I got it and it works fantastically. If it happens to die out or start malfunctioning I will update my review. I think this is "refurbished" b/c it's missing one small accessory that comes standard with the vacuum. This would be the "multi-tool" which is just a small brush for upholstery. You can get the replacement part on Shark's website for $12.95 so it's worth it to but the refurbished one if you have a coupon and also if you are an o.co rewards member. OR, you can just use the pet power-brush that comes with it instead b/c it probably works better anyway. As far as performance...this is the first vacuum that I've actually spent some money on and I cannot imagine getting a better one for this amount of money. I actually can't imagine spending $400 or $500 on a vacuum and being any more pleased than I am with this one. The amount of dusts and lint that this thing picked up one a carpet I vacuumed a week ago was amazing. A+, strongly recommend.