He said he wanted to leave for another club already a year ago, so it's not that surprising that he's finally leaving... somewhat odd that he left for a rival, but after the **** season he had i doubt that there were many clubs interested. Wouldn't say it's a bargain, but decent deal for both teams, as I doubt they would have gotten a better offer. I rate him higher than Meireles though so for Porto it'll be a good replacement if he should leave.