Using IDEA, but tried Android Studio and Eclipse as well.
I think IDEA better than AS because AS is based on IDEA - means updates always come first to IDEA.
Eclipse looks huge and slow, but I use it for android native sdk development.
I switched from eclipse to android studio. It's just a more polished dev environment. With eclipse I was constantly dealing with bugs and wasting time fixing them. AS has been so pleasant and easier to use. Love the darkula theme it comes with which makes it easier on the eyes in those long coding sessions.
I still use Eclipse for most projects, but Android Studio has made leaps and bounds in the last year, so I think it is just a matter of time before I switch over. I am using IntelliJ for a project and it is nice and quite refreshing compared to Eclipse, but IMHO I feel it is a tad quirky to navigate around a project.
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