I ordered these briefs in a size larger than I normally get based on a previous review.  I'm glad I did.  I usually take a 6 and the 7 fit well.  The panties do stay in place, however I would not say there are no lines.  Although you don't see a "line" you can see a slight indentation were the panty line would be.  I also ordered the Jockey brand no line panty and found that I like them better than the Bali.  No panty line at all.