I've tried what feels like a hundred themes, no kidding. And for my various blogs and websites I usually find one that is closed to what I like, create a child theme, and then hack away on it.
Not with Tempera. It met my exacting standards for what I wanted and while I may have been tempted a few times to create a child theme and modify it, I haven't needed to between the many amazing features of the theme and it's ability to allow me to changed many aspects of how I want it to work and it's ability to play nicely with plugins that allow me to extend it.
Excellent theme, and some great help on the developer's website. Can't go wrong with this theme and their others.
Good WordPress-alicious stuff.