Have you ever played on "Non-stop Climax" Mode?

If you have what's it like and did you beat the game? What was your experiance like, was it easy, fustrating, did it take you days to finish etc?

When I first played, I played on "Hard" mode and got my but kick a few time while there were so many enemies i kept wondering if it would ever stop, so when I finished and saw there was a harder mode!...I chickened out, lolXD