Pros: You can play Flac and games to booth
Cons: Itunes is a pain at times
I recently upgraded my 16GB version to 64GB for less than 200 bucks. I wanted to upgrade to the newer models, but I'm not going to waste my money on something that can play the same music for more money.
Anyways, the sound from the Iphone 4s is excellent to my ears. It's gets better with different audio apps in its stock form. You don't need to hack it, to unlock it's full audio potential. Just buy some apps and call it a day.
So my first app that I enjoyed for a while, was the Denon audio app. You can make your own eq curves. Sounds really good without an amp.
Second app is BBE Pro. This app will bring out the bass along with sound stage, when hooked up to an amp. Love this app with my bass heavy mp3's.
Third app is Kaisertone. This app will give you a 30 band EQ and a few DSP's. This is my favorite to play Flac files with.
Once is a blue moon I'll use Neutron.
Now I listen to my music a few ways.
1. Through the 30pin connector, into my FIIO E12A.
2. Through the audio out, into my FIIO E12A.
The first method you get what you get with FIIO L9 or L11 connector. With the L11, you have to choice to use your own cables and charge/sync at the same time. But I can't barely tell any SQ differences between cables.
The second method you get get to hear a difference in your cables you use. Friends and myself can hear SQ differences when swapping cables. I like this for when I want a mechanical EQ just to tweak my sound faster depending what I listen too.