For the Vlad vs Swain: I don't know the matchup, but as i experienced Swain is extremely bad pusher, so if you push the lane to swain he can do nothing against you. Actually Vladimir is a great pusher. :o
So again: The question is just how good you are with vladimir, vlad have a great counterplay potential against swain, even if he is much weaker in an all in fight (but what idiot vlad try to all in against swain? o_O)
vlad has a really weak early game + no pushing ability until he is aorund lvl 9. if he tries to push hard before he hits lvl 9, he will lose too much health just from his e.