First thing I tried was uploading some images on it, but can't upload files via USB storage, have to use iTunes for that. I'm a linux user, so had to install windows on VirtualBox and then forward the USB por to virtualized iTunes. After doing that I realize that can't just place files on the filesystem, files are bound to a particular application, so I have to upload the images to an image viewer, and that program "owns" the files. Also apps seem to be isolated from each other, when on Android they often communicate via "intents".
Then I went to the App Store to get some apps to get started, and it asked me to create an Apple Id, I entered the info, then it asked me for credit card number.. I just wanted to get some free apps and skip the credit card part, but it didn't let me continue without it. So cancelled the Apple Id creation, went googling, and after a few tries managed to create the Apple Id account without registering a credit card (you need to download a free app). Seems that it's persuading you to enter a credit card, since the "none" payment option wasn't visible by default. After browsing the store for a while, most of the apps are paid and it's pretty hard to get free apps. You can't really get any decent app without paying, on Android 90% of the apps you'll use everyday are free.
So, overall it feels limited, there is no contact with the underlying filesystem or OS, most apps have very poor or zero configuration, and trivial tasks (like uploading files from your PC) require extra cumbersome steps. Seems to be designed as a device for consuming, a toy, not something you're gonna work with. My desktop computer is far superior than an iPad.