What further features and functions might I find on wheeled garden leaf and litter vacuums?

Billy Goat TKV650SPH Estate Series

Self-Propelled Lawn Vacuum with Chipper Chute

• Self-Propulsion for Ease of use
• 2 or even 3 speed drive systems 
• Extra long hose accessories for clearing under bushes, on flowerbeds
• Extra large collection bags/containers of 250 litres or more (can be as large as to 700 litres)
• Pneumatic tyres for work and stability on rough terrain
• A chipper included to deal with large branches
• Vibration free handles
• Ball bearing wheels
• Conversion to blower