Is Pre-Infusion Really Necessary?

So, apart from the millrock competition, I've always used a non pre-infused machine. Whether it be my Isomac at home, or the Linea(s) at work. I'm really wondering what everyone thinks on this issue, and why so many new machines advertise it as though it makes a huge difference. I have had many of the best shots ever come from the non-infused Lineas, and same for my home machine. Are synessos pre-infused? Is there a difference between just turning the pump on for a second, letting it sit, then running the shot? Thats what the Frankes do, and getting even palatable espresso shots out of those things is not easy. Love to hear what everyone thinks. Any solid evidence of benefits/downfalls for either side?

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