CLUMPING?

I am thinking about purchasing a John Deere riding mower and I was wondering how the cut is. I have had a large walk behind side discharge mower before, and unless you cut it every 3 days and barely cut anything off, it would leave many clumps after shooting out. Do John Deere's do this even if you cut the grass every 5-7 days?

Mine does that when I let too much grass collect on the underside of the deck.

Ok. That might help. Thanks.