A confirmation from Arsene Wenger. "He is at Manchester United, unfortunately for us. The transfer was finalised in the afternoon. It's never great to lose players of that quality but he only had a year contract."
Piers Morgan: "Funny, I really thought @Persie-Official was different. But he turned out to be just another mercenary, heartless, selfish little s**t. What a sickening betrayal of Wenger too - the man who stood so loyally behind @Persie_Official through years of injury. #VanPursestrings
Ian Wright: Sad that an AFC player has gone to a team who use to consider us rivals! God forbid a big team comes in for vermaelin ! Would he stay ?
Rio Ferdinand: 'Welcome to Manchester @Persie_Official!! Ready to win some silverware? #manutd.'
Arsenal fan: 'I have one Arsenal jersey with your name on the back, @Persie_Official. I will spit on it before I burn it.'
Anonymous: '@persie_official i would go on a rant about you, but im too busy taking out the knife from mr Wenger's back.'
FshawOfficial: 7 years..always injured..Wenger stood by you. damn...this hurts. oh well..We rise above bullsh*** as usual. up Arsenal!"
@DavidJonesSky Honestly think the RvP transfer is just the spark the Premier League needed post Olympics. Football is coming...
@ollieholtmirror Van Persie signing big statement from United. Blow for Arsenal, obviously, but still think they can have good season.
@henrywinter I hope @Persie_Official has the class to thank Wenger for taking a gamble on him in 2004 when others wouldn't & backing him during injuries
@lukeyhills No way could @Persie_Official do two seasons on the trot! It's only a matter of time before his knees give way #AFC #Arsenal
@DutchGoonerCov @Persie_Official I guess this is it then. I won't insult you, I'm Dutch. Goodbye. I would say good luck, but not for that team. No way.
@ahmed14ali This is officially the worst news I've heard for 15 years ! I thought @Persie_Official was different to the rest but ... Oh well #gutted
@leebyron To be fair, its going to be pretty sad hearing @Persie_Official get the same reaction from the crowd as Cole, Nasri, Ade after last season..
@colemikori Hey @Persie_Official I'm a gooner from America and you just made me very sad. Your exit is just as typical and equivalent to that of Nasri's
@D_Tiller RVP has gone....we have bagged £24mill!! Go get Llorente!! We HAVE to!! #RVP #Arsenal #Llorente
@simbizhanje As a staunch #Arsenal fan, RVP has committed the ultimate betrayal.
@premy97 I really don't blame Van Persie for leaving but I really don't think people should offend him as much, he is not like Cole and Nasri
@stlawal Arsenal will be underdogs in every game now, but that will work in our favour, RVP is world class but glad the saga is now #OVER
@gooner1886_ I'm glad that the Van Persie saga is over now but I only wished he didn't join another PL team!! I feel angry & let down by Van Persie!
Michael Carrick: He had a terrific season and he will further strengthen our squad. It is a great boost going into the new season. He is a world class player and we have always been about bringing in players of that ability.
Harry Redknapp: "I could see Manchester United winning the league next year, now they've got Van Persie. He could be the difference. He really is a great signing."
Danny Needham: "Arsenal need to congratulate RVP's contribution and be ecstatic with £24m. Just unfortunate he's heading to Manchester."
Mark Thompson: "Thought RVP was better than that but £24M for a 29-year-old with an extensive injury record is a good deal for AFC."
Chris Goodall: "RVP may provide some goals but he won't give Man Utd the composure in midfield that cost them the title last year."
Nigel Winterburn: "What they need to do is work out where they are going to replace his goals. They have players to do that I think in the likes of Lukas Podolski."
Source: Twitter and football blogs!