A bargain and sale deed is a type of deed where the seller is saying that they are transferring their ownership to the buyer. The type of deed used most often in NJ is a bargain and sale deed with covenants against grantor's acts, which means that the seller is transferring their ownership to the buyer and they swear that they didn't do anything to mess up the quality of the title.
You can go to
http://en.wikipedia.org/wiki/Deed to read more about the different types of deeds.
As long as your friend had a title search performed and obtained a title insurance policy as part of the purchase then the deed is fine.