Pros: Another great tool! The asset unpacker was good, but I feel that this works much better for beginners and people unfamiliar with how .pak files work. It most likely has uses outside of starbound modding as well, which is a HUGE plus!
Cons: Well. There's definitely one thing to point out.
There's people who will beg for a way to unpack assets from mods, More often than not, those are the people who would rather steal assets from said mods, rather than anything else. It's important that it's noted on the mod's info page not to use this for stealing mod assets for use in another mod, without the creator's permission.
Can't say much! The pros and cons speak a lot about this tool already.