Quote - *If it's content that came with Poser, the one possible disadvantage to deleting the compressed version, is that if EF issue an update, it will only be applied to the original compressed file.
*I always delete the original obz and have never had any problems like this!

What I said applies more to content updates, rather program updates.
Depending on how they do them, at best you'll have to uncompress again, at worst the update won't happen.