Cheers for your response.
To clarify - TN-V is basically a full working PSP emulator and TN-X runs almost (every?) ps1 game through the Tekken 2 and Sports superbike exploits which has really good compatibility. I've yet to find a game that doesn't work. The combination of the two basically lets me run all the homebrew and backups I'd like, albeit through two seperate exploits so there's extra loading times and considerations to be taken.
That said, having read your response I definitely am intrigued. The possibility of using mass storage is something I was waiting years for. Same goes for the emulators on the console's hardware.
My main concern however, is that certain PSX games will have issues through adrenaline. I'm thinking along the lines of FF8. I remember how much of a *** that was back in the PSP days. I haven't presently got it installed on my Vita, but from what I can remember, I got it working fine with TN-X. I'm itching to play that again at the moment which is why this game in particular is so prevelant in my mind.
Edit: I just saw this thread, which answers the questions about FF8:
viewtopic.php?f=116&t=48038
Edit 2: Slightly off topic now, but has there been any updates to using SD cards on the vita over Sony's proprietary cards? My card is 4gb