Tested
Legit downloaded version from PSN (JP region, downloaded through PSV) works fine
Download PSP iso image into my PSP and it works with no serious problem
But the old style Rondo mode in DXC has some tiny little pieces of issue indeed (frame rate too high with certain situations like opening demo and Shaft fight) but it's not a game-breaking problem on the real console after I got the right way to deal with Shaft
And thought about the emulator problem reports in this thread... I also encountered it. Maybe there's some inner issue inside the DXC old style Rondo mode program itself, I have no idea about it (Personally I'm just not satisfied with what emulators on PC did. FPS is kinda zig-zagged for unknown reason in Rondo mode; and SotN mode is too slow to even move the character)
But since I have PSV as my backup choice I have no further worry about it