I had a bizzare idea once where Dyson would make a Dyson ball mower :P
The ball is good for going around trees, the mini turbine head with blades is good for awkward places like down the side of the shed or behind it or hedge trimming, vacuuum the garden and a brushbar for actual grass cutting xD
We had a Flymo lawn mower which was good and it was cool because it emptied like a bagless vacuum at the push of a button the container opened for the grass to fall out, served us well for about 5 or 6 years then the handle broke and we didnt care cos we were refurbishing out garden and replaced the grass with slabs and made new plants