Just bought a new Lumia 720!

Too bad its the developer preview only, means only the "Developers" should go for it. It was not available for public and this certainly means bugs that need to get recognized and fixed. :)

I've had 8.1 for about a month and I haven't noticed any bugs. Before the update I was going to switch to Droid when it was time to get a new phone but now there's no way. 8.1 is vastly better than 8.0 and I'm no developer. I'm also not app crazy; I like a phone's function ability more than the apps it supports. I think you should have given it more of a chance or done your research before getting it in the first place. Oh well, to each their own.
 
The WP8.1 is being distributed right now with its proper Cyan firmware.

WP8.1.1 is the latest developer build. However it's perfectly smooth, fast, stable and bug free. It had one bug in the initial launch, but it got an update. Now it's flawless.

And as I said, the L720 would've seem far more capable, in every category.