Quote Originally Posted by Maki
does this mess anything up (and all other concerned questions, you know them....) any drawbacks?
Well, when you change firmwares there is always the slight chance to brick your PSP, meaning make it completely useless and unfixable. This is an uncommon thing nowadays though. Dark Alex (the guy who made this firmware) basically combined firmwares 1.50 and 3.02/3.03/3.10. This means that it has all the features of the recent firmware and the homebrew & hacking capabilities of the older firmware.