I bought some Andis agr 2 speed at crufts at the weekend, I did a fair amount of research before deciding on them, and although they feel quite heavy to me, they are comfortable.
I have yet to use them on Ella though, as she is going to the groomers next weekend, so I am hoping to be able to 'keep up' with it until the grooming course in July!
good luck with what you decide!