How much better is the Roomba 880?

I currently have a Roomba 560 with the upgraded AeroVac brushes. It works pretty very well. However, the brushes are worn out and it needs a new battery. So, I’m considering upgrading to an 880. Supposedly it cleans 50% more dust and has a better dirty detection sensor. What are your thoughts? Should I buy the parts for $130 or the new Roomba for $650?

[size=2][font=Arial][highlight=#ffffff]The Roomba 880 does have new features compared to the Roomba 560 such as:[/highlight][/font][/size]
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[size=2][font=Arial][highlight=#ffffff]Tangle-Free AeroForce Extractors: Dual extractors grab and break down dirt and debris from any floor type with no hair tangles for you.[/highlight][/font][/size]
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[size=2][font=Arial][highlight=#ffffff]**Airflow Accelerator: **Creates a sealed channel that concentrates airflow, drawing in more debris.[/highlight][/font][/size]
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[size=2][font=Arial][highlight=#ffffff]**High-Efficiency Vacuum: **Provides a 5X improvement in air power than previous Roomba generations.[/highlight][/font][/size]
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[size=2][font=Arial][highlight=#ffffff]iRobot XLife™ Battery: iRobot XLife Battery delivers twice as many cleaning cycles as previous Roomba batteries, doubling the time before you may need to replace your Roomba battery.[/highlight][/font][/size]
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[size=2][font=Arial][highlight=#ffffff]**Finds Dirt And Debris: **With Dirt Detect Series 2, Roomba uses optical and acoustic sensors to find dirt and perform concentrated cleaning.[/highlight][/font][/size]
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[/highlight][/font][/size][size=2][font=Arial][highlight=#ffffff]These features do help the robot pick up more debris and the brushes are also much easier to clean that previous models.[/highlight][/font][/size]
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[/highlight][/font][/size][size=2][font=Arial][highlight=#ffffff]It is more expensive than buying replacement accessories but by buying the Roomba 880 from RobotShop, you will be sure that you are set for 5 years with our 5 year warranty. [/highlight][/font][/size]