Jerky/hunting FI....another question

Has anyone on here ridden an SD which has a fueling issue and one that doesn't? Would be interested to hear their feelings on the differences. I've ridden 4 so far, no problems on any of them, really want to get my hands on one with issues so I can see for myself the difference between the two. (Specially as someone rode my previous one and said the fuelling was too harsh for them, whereas for me it's perfect).