Hi. I intend to buy an iMac soon (waiting for the forthcoming update). But there is one thing bothering me. Read many reports that Lion is not an improvement over previous versions. Since I never used any version of MacOS, I won't notice differences this too much, but are these reports true? I read about Lion being too "bloated" and not as responsive as earlier versions. I've dabbled with a few iMacs at stores, but there's nothing like day-to-day usage to sort this out. Thanks!