I'm not sure how I feel about the lower-case f, but I love how the l, i, and j are all easily distinguished from one another, and the font looks generally pretty darn pleasant.
I'm studying Japanese now, and I wish it got the same love. One high quality sans-serif libre font would be enough. I guess most non-Latin character sets suffer as well.
"Please do not try to download just the .deb or .tar.gz on its own; the test fonts change weekly (normally on a Monday) and having old copies of broken/superceded versions is producing incorrect bug reports. Even worse documents are ending up with the out-of-date fonts embedded in them."
Apparently they're still polishing up the font, so the Ubuntu guys offer it as a package for easy upgrading. That's my guess at their reasoning, anyway.
That's correct. They even considered delaying a release like this because it's not 100% finished and they didn't want too many versions of the font in the wild.