As a somewhat recent practicer of tdd, I find that the koans + tdd approach is more rounded: I'm forced to learn/use a function/aspect that I might have glossed

As a somewhat recent practicer of tdd, I find that the koans + tdd approach is more rounded: I'm forced to learn/use a function/aspect that I might have glossed over. And occasionally a particularly nice usage of syntax jumps out and gets adopted.