............The download is free, try it out. They have plugins for pretty much everything now so github, svn etc all works 'out of the box'.
I setup the "Community" (free version), which has the Android plugin integrated, on my Win7 64bit system. I used the 32-bit versions of the JDK and the Android SDK. Downloads and installs went smoothly. I then did the "Hello World" app from the IntelliJ web site. In general this went well, although there were a few points where reality didn't match the tutorial, perhaps because the tutorial was done for version 9(?).
Apparently I was able to guess my way through these points since the app did build and run in the Emulator -- that is on the third try. The first two times gave errors. Once past that point, running in the emulator went fine, although a little slow to get going.
So I exported the .apk using the export wizard tool. This went fine including automatically invoking the signature key wizard which sets up a local keycode store and generates a signature for you -- although again it took three repeats before this completed without error.
I don't have an Android device (yet) so emailed the .apk to a friend who has a Verizon Motorola Android. He used this handy website -- apkinstall.com -- and quickly had the app installed and running correctly.
I'm favorably impressed so far, although the two places where the exact same operations had to be attempted 3 times before they succeeded are a little troubling.
Regarding the lack of a WSIWYG gui editor, someone recommended DroidDraw for this. It generates XML that you are supposed to be able to just paste into your IntelliJ project files.