well, from my experience (bought one of the old psps on ebay, turns out its downgraded),
it´s a two-edged sword, I guess.
It´s cool to be able to store a variety of games on the psp itself, but then again, where
to get the rams legally...
On the other hand, turns out that upgrading that thing once it´s downgraded proves...
let´s say difficult, and that´s just because I don´t like the word impossible.
And many new games seem to require a newer psp-version, so personally I´d recommend you
to let your psp as it is (not even mentioning the possibility to break it while trying
to downgrade it), I´m probably even going to reupgrade mine somehow... it´s starting to
piss me off a little....
hope it helped, greetings!