Depending on what is "safe" for you.
Disadvantage of CIA's generated by by PlaiCDN is "dirty" tickets.
Why is it bad? Here's an example:
You installed CIA (a game or update) on 3DS which never had that title installed before.
Then you decided to delete that CIA and redownload same title from eShop.
If your CIA was generated by CDNto3DS/PlaiCDN, or if you converted it from .3ds yourself,
eShop will give you an error at 99%. If your CIA was generated by FunkyCIA - it will finish
downloading without any problems.
FBI can delete tickets from ticket.db now, so it shouldn't be a problem anymore if you want to buy game you have pirated.
But if we actually would make own tickets with valid keys as
@cearp and
@gamesquest1 suggested - we would be able to
redownload games from eShop without even buying them (of course, someone'd have to buy them first to get valid keys).