This theme is really, really good. I like the elimination of the stupid header images that no one used and the greater focus on type and large images. This theme, more than the other twenties is really a good starter. It comes with all the support you'd expect and not a ton of layout-related styling. I could actually see myself using this as a base to edit in the future.
It is really good. I switched to it late last night, from one of the "premium" themes. I still need to tweak/optimize a bit (particularly the sidebar), but I'm really happy so far.
There are a lot of little details I keep finding which were a big improvement for me (author pages in particular).