I need to preface my comments with the face that I only have an Asus Transformer Android tablet. I don't have an iPad and haven't used one, therefore the following comment may be incorrect.
The problem with using my tablet for any serious content creation, like writing a thesis, is that the applications provided are, in my opinion, shit. My Asus Transformer has the keyboard and I use a bluetooth mouse. However, trying to use something like Documents to Go is a total pain in the ring. The spreadsheet side of things isn't any better than the word processer. Tried using the Google Docs App on an Android tablet? Also shit.
And browsers, which are meant for consuming content, also largely shit. I have Dolphin, Opera and Firefox Beta all installed. I have to use all three at different times to effectively load various sites. Then they will frequently crash, which is shit. They're also slow when compared to my desktop browser.
I use a product called Hootsuite to manage multiple social network presences, for work. In a browser this is a brilliant service. The App on Android is shit.
The best thing about my Android browser is the default mail client and its ability to connect to an Exchange server, which I am yet to master with Thunderbird. Skype also works better than Skype for Linux.
Overall, my tablet experience has been pretty poor, and I'm not convinced by the whole App mindset. My Transformer gathers dust most of the time, and may end up on eBay soon.