The ability to easily switch between how your iPad browser is identified has real advantages. For example, I have my iPad browser idenitfy itself as Internet Explorer 9 while using SharePoint sites, but if I need to read Google Analytics reports, I switch my browser's identification back to Mobile Safari: iPad (see screenshot).
There is logic behind these actions. SharePoint, being Microsoft software works much better with Internet Explorer (surprise, surprise). However, Google Analytics loads charts using Flash. If I am using a browser identified as "Flash capable" like I.E., the page load times are horrible. However, if my browser is identified as Mobile Safari: iPad, Google Analytics knows not to attempt loading certain charts and graphs, but the data tables load fine and quickly!
I'm certain there are many other occasions where the ability to easily switch back and forth how your browser is identified would be valuable. For instance, while I.E. is useful for many sites, if you are on site with embedded YouTube videos, having a browser which is identified as I.E. would not be good. It would not understand that your computer does not render Flash. However, if identified as an iPad, the Youtube videos will play via the iPad's built in technology.
Finally, if your organization requires authentication where pop-up window login screens appear, that process generally works better via I.E. than Safari. I've actually published a manual of many of my favorite iPad apps.
Hopefully you understand these examples. The iPad is a great device, but there will be times where it is useful to "fake out" the site you are viewing and have it believe you are using a different kind of device / browser.
For the purposes of what I explained above, I burned an entire dollar to purchase Atomic Browser. It was well worth the expense.