That's interesting. Do you not find them awkward and heavy with the big battery hanging off the back?
I have a bosch 18v brushed 4.5 and it's fierce handy for quick jobs, but if I was doing any real fabrication I'd have the metabo and bosch corded grinders out, I find the balance so much nicer.
I probably use the cordless one more than the other two purely on the basis of picking it up, cutting a bolt or a bit of steel and putting it down again convenience, but for any real amount of work I don't like the weight.