Eh. The performance and the notation is important to me, and I haven't seen a lot of benchmarks (or any...) indicating that J is particularly fast. And from what I understand, even Iverson eventually decided that J was a step backward from his notation-first APL.

But mostly what I'm wondering is if those downloads are 32bit-only, or time-limited in the software, or memory limited, or if it's a winzip-esque honor system limitation. Not as interested in the license.