It's beautiful.
Downloaded the update earlier today but decided to try it after reading these posts.
Siri is a joke because it's so slow.
As tempting as Google Now is, I can't switch. I've spent far too much on iOS apps and am far too invested with things like iTunes Match, iMessage and Facetime. I just hope Apple can drastically up their game. Maps, constant Match outages and a slow Siri are annoying.
Edit: actually, I wouldn't even consider switching until Google completely overhaul their ugly as hell UI. Google Now is amazing but the Android UI is downright awful in my opinion. So messy and non uniform
I seriously considered switching but honestly there is no perfect phone for me, I would have to deal with my own annoyances using an Android or a WP8 device, the iPhone 5 is probably the 'least' annoying to me right now, and I'm hoping there are a lot of improvements ahead.