I have a tablet. So often I try to type on it & use a terminal, and it is terrible. I get used to the size and key configuration but what I have problem with is hitting my fingers in the glass surface repeatedly. Doing it for a minute or two is ok. Doing for an hour is painful.
Also noticed on a tablet I become more of a passive consumer of a information -- I read mostly. On the desktop I am more inclined to produce -- I write code, type comments, write email.