I personally converted from all childhood of using nokias to using Android, about 4 years ago.
Had the HTC wildfire (at the time was an ok phone)
Ran basic games, but got slow close to when the memory was full.
And could not transfer the files and apps to the memory cards because of how android works
had to install custom android OS (cyanogen mod) in order to speed it up
And then last year got my self the HTC ONE (m7) as soon as it was available in the shops.
The best sound i have ever heard from a mobile.
The camera is amazing (its small resolutions, so you cant print massive photos,
but at the same time it was the best low light camera, due to its new sensor)
Main reason why i got the phone because im a photographer and i like having
the best low light performance, I use variety of professional gear for work, but
i even surprised my self with the results that i got from the phone, but most
phones give you extreme amount of noise/grain in low light conditions.
"Its not all about the pixels maaaan!"
Never slowed down, even for once.... And i use my phone extremely intense...
Runs all games that i put on it without even a flicker, while running a bunch
of other apps in the background.
Also amazing build quality, (i have to admit, its a sexy phone)
Also voted to be the best phone of 2013 And at one certain time
was the best phone in the world according to reviewers.
Would definitely recommend it.
The only thing i would say a con (but its not huge, because HTC have released an update)
The HTC version of android (HTC SENCE) had a few bits that ware
annoying and you couldn't get rid of the main screen. But its fixed now.