Robin, thanks for the link, I've been wondering where I could get some kind of decent explanation of pros and cons of this deal.
I find it reassuring that Ackman was sitting on a giant pile of cash for so long, and resisted the temptation to splurge it too early on a low quality company.
He does seem to have a reasonable record of timing his bets, and I think I still back his judgement for the long term.