Gus Mueller, on his blog, about taking the time to squash bugs that weren’t even reported in Acorn:
It took months and months of work, it was super boring and mind numbing and it was really hard to justify, and it made Acorn 5 super late. But we did it anyway, because something in us felt that software quality has been going downhill in general, and we sure as heck weren't going to let that happen to Acorn. So we took a long break from adding features and just fixed stuff.
Acorn has always been good… this release looks really solid. If you’d like to support independent Mac software developers this is exactly how you do it; buy Acorn.