Clearly I'm going to be biased but I see daily the time and effort that goes in to designing and testing our machines so I'm more than happy to recommend them
I don't work on the lawnmower side anymore, I'm lead engineer for the handheld stuff and shredders these days so spend my days playing with chainsaw and the like 
I'm not sold on the twin battery machines, they'll always run to the worst or lowest charged battery which is a pretty major limitation as the batteries age IMO. Bosch 36V tools batteries are largely interchangeable, only on older stuff might there be some limitations as we were first in the 36V Lithium Ion game over a decade ago, but if you're only now buying in to a battery system you should find everything works together fine
Happy to answer any questions if its useful, I've probably tested most of the machines on the market at one point or another, or can ask someone who's taken them apart for competitor assessment 
My sister put her lawnmower on her front lawn, unreeled the cable, and took the end of the cable indoors to plug it in. The next thing, the plug was pulled out of her hands. She ran outside and found a pair of dodgy geezers about to sling the mower on top of a pile of 'scrap' on the back of their vehicle! They claimed to genuinely believe that a mower on a lawn with a cable going indoors had been left out for the 'scrappies' to collect...![]()

A Bosch Rotak has given good service for 10 years at my static caravan.
The lowest setting isn't very low, so not so good if you want a lawn to rival Wimbledon.
Realistically though if you want a wimbledon-like lawn you need a cylinder mower, not a rotary
I used to work on the old Atco machines back when we still owned the brand, they were awesome bits of kit 
