Interesting article - not sure they are all iPhone 4S beaters per se, but there are some very decent phones there. Moved away from 3 years of iPhone (3g and 3gs) use 3-4 months ago to android and the Galaxy S2, and couldn't be happier.
I moved after some spectacular fails on the part of Apple service (I got robbed on the iStore and they utterly failed to do anything about it - refused to reverse the transactions, refused to even say whether or not they'd help the police in a trivial prosecution, and avoided answering any question, instead using boilerplate text designed to get me to go away).
My first iPhone (3g) had suffered a hardware failure after 15 months forcing me into another iPhone (3gs) contract (particularly if I wanted to retrieve my contact data and not pay another £120 unwanted airtime), and when the glass screen of the new one cracked the apple shop wanted to replace it for a 'very generous' refurbished phone price of £249. The internet provided me with the solution to that for £13 and about 20 minutes of my time with a hair dryer.
I loved the iPhone and iOS a lot and recognised that (from the 3g onwards) it was a real game changer. My early adopter friends with android were singing it's praises and so I periodically got to play with their phones. In my own opinion the UI overtook iOS about 18 months ago, and when my contract expired I moved over to android.
It took me a weekend to de-iTunes my computer (re-encoding my music to normal formats - not entirely necessary - but cathartic), a couple of abortive efforts to buy a 32gb class 10 microsd card from eBay for small money proved annoying, but easily resolved by moving to class 4 (there's only music on there so it was irrelevant). After that it was plain sailing - I bought the Galaxy S2 outright, sold off the old 3gs, moved to giffgaff, and will have repaid the TCO difference within 10 months - so I'm no longer trapped to a contract after a phone has run out of warranty, and if giffgaff ever give me trouble I'll immediately move, at a loss of, at most, a tenner. It also has a 3 year accident and spills warranty purchased for £49 via Amazon - considerably cheaper, longer lasting and wider ranging than Apple's warranty offering. If you have the initial cost of the phone available it's something of a no-brainer to stay out of a contract.
Android isn't entirely perfect - the native music player's shoddy and pod-casting is handled poorly generally, but the market place solved those pretty cheaply. I've had no problems with the market place and, since android outsells iOS 3-1 (approx) at the moment, there are more than enough apps (usually free) to keep me happy, and I suspect that won't change. I also invested another tenner in a couple of spare (Samsung branded) batteries and a wall charger for them, meaning my phone never needs to be tethered to the wall for any length of time. I'd love the android phone community to place a sufficient capacitor in their next generation of phones to make the batteries hot-swappable.
I can't speak for the other phones but have to say the Samsung Galaxy S2 is far and away (for it's time) the best phone I've ever owned (including my old beloved SE T28). After a few months it's never felt flimsy (a complaint I often see bandied about it) and always felt light with plenty of screen space for not much bulk.
I also can't believe that Apple seems to be getting away with claiming it's twice as fast for internet because they finally support hsdpa. That's some brass neck.
Cheers for reading this far - I hope that was an honest depiction of how a former fanboi found happiness elsewhere... I still have lots of friends who rave about their iPhones and more power to them, but I reckon I've found the greener grass.