Judge Bybee is a scholar. And even if you didn't know that before, you can tell it from this opinion. Which is written precisely how you'd expect a former law professor to write (at least on this topic).
Personally, I like it. It's a comprehensive, structured, coherent, and (in my mind) persuasive analysis of the issue. Plus, I agree with the equities. A sentence of 28 to life merely for failing to re-register within 5 days of one of your birthdays is simply too much. As a matter of both fairness as well as the Eighth Amendment.
Of course, maybe that's just one professorial kettle calling a professorial pot good-looking. But I'm on board for that.
