Let's say you leave. Where are you going to go next? Android? Windows Phone?
If you think iOS 9 is unpolished then get a load of those other two operating systems. I'm not saying they're bad, but the comparison with those opposed to iOS is almost like night and day when it comes to being "polished".
This. My list of devices used in the last 3 years includes the S3, S4, Note 2, Note 3, Note Edge, iPhone 5, 5S, 6+, as well as BlackBerry Z10, Q10, and Z30, Nokia Lumia 920 and 1520 (WP). So I've checked out the color of the grass on all sides of the fence.
And my findings? Finally feel at home with the 6S. No it ain't perfect, but much more polished. Plus Apple seems to be kicking out updates at a pretty decent pace. Listen, updates is what finally drove me off of Android. I finally had enough of wondering if my device would be updated to the most current version, then sitting wondering if Verizon was ever going to push it out, then when my Note Edge finally got Android 5.0 it ruined the device.
That's not to say Android is all bad. If I absolutely had to I could go back to it tomorrow. But I'm glad I don't. My 6S runs great, does everything I need it to, and then some. And I know as soon as Apple pushes out an update, it will be available right away.
I'm not saying don't try android...just saying do your homework and some serious research before you do.