Ah ok misunderstanding there sorry for that.
Got 3 PSP`s myself 2X 100x and a 300x.
Still got one of the 100x models running on 5.00 M33-6 also.
Dunt know why really but I use timemachine on it and I do not feel like getting trouble with that or any of the emulators that I run on it.
Tried my memstick + pandora in the 5.50 also works fine but I just prefer to run it on M33.
As for the other 100x I have 5.50 GEN-D2 running on it and I use it to play PSP games.
Iam very sure not all games function on 5.00
If all games that you want to play work that is nice for the moment.
But like I said the reason new CFW was released is to support newwer games.
It is very likely games will get released that require GEN firmwares you want to play.
As for now I do not see a new M33 firmware get released soon.
At first I tought the GEN firmwares were dodgy but they seem to be working just fine.
The only thing I would like to see is a mem stick speed up hack for GEN D2.
Not that I really notice a huge difference.
Do as you please everyone has his own favorite.
Greetz, Vistabuser.