Forced To Jump
I'm a HUGE Apple fan.
I've basically owned every desktop Mac from there has been from an LC475 to my current Mac Pro.
I've owned every laptop since the Titanium G4 and my wife and I every iPhone from the classic to the iPhone 5, so (as you can probably guess), I'm heavily invested in the Apple eco system and also have an Apple TV and an iPad4.
If you are looking at Apple's 'target market' then I'm it!

BUT...
I have changed my phone to a Galaxy Note 3.
This decision wasn't taken lightly, but I lay the blame for this squarely at Apple's feet...let me explain...
I was one of the people who thought Apple's choice of dimensions for the iPhone 5 was strange - I think it should have been made even larger.
I owned a 64GB iPhone 4s and when the 5 came out and (despite the weird screen size) I got one for the wife.
This may sound weird but it felt like a girls phone to me.
They had made it slim and light and because it was longer it felt narrower too (even though it wasn't).
The black model's revealed scratches so easily that some had them brand new out the box, so for me white was the only viable model if you wanted an iPhone 5 and it felt...well...too girlie!

My wife loved it though, and it had a bigger screen than her old 4s so she was a very happy bunny, but I decided to stick with my manly (heavier) 64GB 4s and wait for the next model before upgrading.
Patiently then I waited for the iPhone 5s. My 64GB 4s was always full, so I was hoping Apple would release a 128GB model - after all you can get 128GB iPod touch right?
Also there was to be a new OS called IOS7 which would make the phone feel new and sleek - great!

So Apple announce the 5s with almost exactly the same spec as the 5 and (unbelievably), exactly the same storage options as my two year old iPhone 4s - very disappointed.
The final nail in the coffin though was IOS7.
On my iPhone 4s it was just walls of white and an assault on the eyes.
On the iPhone 5 & 5s it may have translucency to soften things, but on the 4s it was just a slab of white, so it was just too bright.
They changed to a very thin font and made the UI garish and difficult to read (even on my wife's iPhone 5) and the real killer was...you guessed it...no way to go back to IOS6!!!
Thanks Apple!
I don't want to fight to use my phone, but going from IOS6 to 7 that's what it had become.
All the buttons...GONE!
Calendar...List view...GONE!
(it's actually there, but hidden and awkward to get to and you can't add anything in it).
The UI that'd i'd used for years suddenly became difficult to navigate and (for me at least) difficult to read too.
Everything had lost contrast. Thin black writing on bright light grey backgrounds.
The Keypad for the phone was MUCH better and easier to read in IOS6.
Same goes for the keyboard for text messages too.
I just wanted a phone with more storage and that I could easily read again.
So I after a bit of deliberation I went for the Samsung Galaxy Note 3.
32GB internal storage plus 64GB on an SD card gives me 96GB in total.
The screen is HUGE, so for reading texts, emails and browsing the web it is brilliant.

The real plus though (and one I haven't seen mentioned anywhere) is how it interfaces with my TV.
If you have a modern Samsung TV with wireless capabilities, you can use the phone to show Photo's and video's (a bit like an iPhone with an Apple TV), except there is nothing else required...it even automatically switches the TV input over and then back again when you finished...GREAT!

It genuinely is just a click to do it.
AND...
The TV will stream to your phone too - brilliant for watching the footy in bed!

So I'm really liking the Note 3 and my wife liked it so much, she now has a Note 3 too.
There are things that I miss from the iPhone.
Notifications are better on the iPhone IMO and Mail is a better email client than anything on Android.
K9 (my email app on Android) is still good though, so it's not a deal breaker.
The iPhone camera is MUCH better than the Note 3's too and because it's smaller, the iPhone is a much easier handset to use as a camera too.
According to a recent article on Mac Rumors Apple are addressing some of the UI problems in an upcoming update to IOS7 and the iPhone 6 will have a bigger form factor which should make it easier to read.
If true, then my next phone will probably be another iPhone, but I have to say that the Note 3 is a VERY good phone and I also like being able to handwrite notes on it (very handy) and Android isn't nearly as bad now as it was when I briefly tried it in 2010.
Overall I think Android isn't nearly as 'clunky' as some people infer.
IOS6 remains the best OS ever produced for a phone IMO, IOS7 offered some improvements, but from a UI point of view was a disaster.
Mostly change for changes sake and most of the changes were bad, resulting in making a nice easy to use OS more difficult to read and navigate.
I didn't want to go Apple pushed me!!!
Since I purchased my Note 3, my wife has purchased one too and next month my sister will be getting an Android handset as well - all because they find IOS7 difficult to read (We're in our mid 40's).
Apple need to address these issues quickly as if they can lose a huge fan like me, they'll lose many others too.
To summarise...
Make IOS7 easier to read. Bring some of the friendliness found in IOS6 back, add more storage to the flagship model and make the screen bigger.
If they do that Apple will probably get me back - don't and they won't!
For anyone else who is unhappy with IOS7 for the same reason, I'd say now would be the time to try an Android phone and the Note 3 would be a good model to look at.