I have the D8 model, and it's good for keeping up with the light daily vacuuming. It keeps the floor looking clean. The battery life is good, and the noise level is minimal. Navigation could use some improvements. It gets stuck and into mischief, so I've not been successful running it completely unsupervised. It misses stuff and doesn't do a good job deep vacumming the rugs, so I still like to vacuum with my upright vacuum weekly. But it keeps the floor lighty vacuumed between cleanings! It's able to complete finish my downstairs on a single charge. If it runs out of battery, it will return to the base and restart where it left off once it's charged. Overall, it's a great helper between cleanings but not a vacuum replacement.