Using Fast Forward Content Types, Slots, etc. in you own sites

I am wondering that, if you have use for the Fast Forward objects content types, slots, etc. in your own site, if it is better to make a copy of these, renamed according you own site and use these in your development, or to directly use the FF objects as part of your implementation? I ask because a) I seem to recall this being said during training or a webinar, b) I have read that is best not to install FF in production and c) One may need to tweek the FF content types, i.e. add/change fields,