I agree with bugbear, that a tablet is not as good as a laptop (or PC) for genealogy use.
I have just recently purchased one, and even though I have internet roaming access, and an online database, it is just too awkward to use in situ. I only now use it as a mobile notepad, and then transcribe those notes into my family tree using my laptop, where I have the opportunity to have other windows open for reference and cross checking.