I used this app a few days ago, first time I tried it, I got a semi-brick. Gave it the benifit of the doubt and tried it again, ended up with another semi brick. Its probly just the plugins I was tryin to flash weren't compatible with this app. (my best guess). A compatibility list for this app would be a great addition to it. Obviously I wont be using this, but I will definitely be looking out for later versions, as it is an incredibly useful and solid concept.
If you choose to use this app, BACK UP YOUR FLASH0!!!!!!!!
Also, if you use the uninstall function, the .prx is still in your flash0,so you'll have to go in usb flash0 and manually delete it if you want it really gone.
And to get rid of this app from your psp, you'll have to delete the folder it creates in flash0,delete the app from ms0:/PSP/Game and then replace flash0 with your flash0 backup on your PC. Just deleting everything WILL semi-brick.Thats why backing up your flash0 is so important.