Without being jailbroken it is nearly impossible to properly utilize alternative browsers. I particularly enjoy being able to choose my default browser (and mapping choice) for links. If when I click a link it always opens In safari, I end up using that browser a lot more than I would given a choice. Apple also hamstrings alternative browsers by not allowing them the ability to utilize the nitro JavaScript engine. The tweak nitrous allows chrome and other apps with in-app browsers the ability to do so, but it shouldn't have to be this way!