According to Enterbrain, the folks who publish Famitsu magazine, the newest PlayStation Portable sold 28,275 units on its first day on the Japanese market. Good? Bad? Probably somewhere closer to the former.
That sales data doesn't tell us too much about the PSPgo's reception in Japan, considering Enterbrain only tracked one day, November 1—the platform's launch day—as part of its weekly sales monitoring window. As for how that compares to weekly figures, the most recent data we have is from sales tracker Media Create, which put non-go PSP sales at 32,865 for the week of October 19 to 25.