You are correct, original isn't long enough to cover up most grips today, not even sure why they still make it. I think extra-long should just be the standard and they should do away with original. I accidentally bought a pack of original last year, I wasn't paying attention. I just cut pieces from another full length one to make a longer grip so it would cover the whole grip on my racquet.
It is thin and dry. My hands don't sweat much, so I only use tourna in the summer, if I use in the winter it stays to dry and slips on off center hits. When it's hot and your hand is sweaty/wet, tourna works great.
"We all have the will to win, but we all don't have the will to prepare" ~Martina Navratilova