Well, just grabbed my Vita and tried it out. Works nice, pretty speedy which is about what I expected based on QCMA transfer speeds. Do have a problem though.
Anyone else having troubles installing VPKs after updating to 1.50? Tried a couple different VPKs (one homebrew, one game backup) and they don't seem to do anything, it just sits at the Installing... screen with 0%. I've let it sit for over 5 minutes (which is infinitely longer than a 3mb homebrew should take to install) and nothing changes. If I cancel the transfer, it seems to get stuck and accepts no input. I can't move through the file browser or select anything, can't bring up the VitaShell settings, can't even use the Home button to go back (it displays the red cross symbol). It doesn't seem like VitaShell itself is freezing, because the clock still works and the battery indicator still works, but I can't do anything else.
I can bring up the quick settings and bring up the power off menu but that's about it
I have to power off to get back into the device.
Molecular Shell installs the VPKs fine, so I also know it's not them.