PlayStation Development Network

I noticed on the PSIO website and the homepage of psxdev.net that it advertises PSIO as the "ultimate developers tool and invaluable as a debugger"

However I don't see much discussion or use as to the PSIO features and am wondering how this truly stacks up against Xplorer FX running Caetla.

Is there anything I would be missing out on by simply owning PSIO and not owning a Xplorer FX?

PSIO is good for testing ISO images which CAETLA cannot do, but the development tools seem to be getting an update soon so PSIO will probably act like CAETLA at some point