Ask HN: Have you used Appcelerator Titanium for mobile or desktop dev?

I stumbled upon the cross-platform development tools by Appcelerator (http://www.appcelerator.com/) and I'm currently playing with it to see if I can use to build a cross-platform semi offline/online application for bands and artists.

I was wondering if anybody else has been using it and I would like to know what your experience is in using it.