Bests & Worsts Reviews from Amazon

I initially purchased the 650 but decided to return and get the 770 instead. They are both great vacuums but here are some things to consider and why I chose one over the other. The main attractant for the 650 is price. It's typically $100 or so cheaper than the 770. It's a great vacuum all around and definitely good value for the price tag. It did its job and kept my downstairs in good condition considering I have three dogs and one is a mean shedding machine of a German Shepherd. I have hardwood with a low rug, and then lenolium in the kitchen. Why the 770 worked better for me: The 650 lacked the full power I needed to pick all the dog hair and misc bits the dogs brought in from outside. The 770 is definitely more powerful with aerovac 2 vs the original aerovac. The other big reason for me was the HEPA filter on the 770. With dogs and lots of allergens in my area it is definitely needed. From watching the 650 for 10 days and then the 770 for almost a week, the 770 seems to be a lot smarter. It hugs corners better and recognizes obstacles more easily. The 650 seemed to bang into stuff with a lot more force although never knocked anything down. The 770 also has a mode for spot cleaning when it finds a dirty spot, making it go back and forth like a person would with a regular vacuum. It also has acoustic and optical sensors for dirt, and the 650 only uses acoustics according to the comparison chart I found. All in all both models are great, but the 770 gets a five stars vs four for the 650. For an extra $100 I feel like it was worth the extra features for my needs. I'm sure going up to the 880 is also worth it but I had to put a cap on what I wanted to spend.