iOS user (2008-2013)
Reason why I may never go back to iOS or even any Apple products for that matter.
-iTunes
I've used iTunes, Zune, MediaMonkey, DoubleTwist, MediaGo, etc. I feel iTunes gives me the best organization but it also slowed down my Windows laptop and Apple keeps forcing me to use it just to add or delete media files on them.
My laptop broke last year with my iPhone sync to that. I got it replaced with another with all my files backed up from a microSD but the iTunes 10+ slowed it down to a crawl at 100% CPU usage. So I couldnt add songs or photos onto my iPhone 4 anymore unless I killed iTunes.
Then I requested an unlock code from AT&T free of charge. But in order for my 3-year iPhone 4 to be unlocked, I had to upgrade to iOS6 and then restore. So now my iPhone 4 has only apps, zero media files except pix in my camera roll, and iOS6 that lags. So eventually I uninstalled that bloatware and Trojan horse for Apple's ecosystem called iTunes and my laptop runs fast again.
And nomore SharePod just to remove files from iPhone since it cant be read as mass storage. I'm aware of the work arounds but drag & drop/copy & paste files is so much easier.
If iOS werent so reliant on iTunes, I might still use them.