I think they are a good addition - if you want something savoury and hot.
Top tip though - loads of LLers (including me) don't buy the LL savoury drinks and instead buy Marigold Bouillon from the supermarket. It is in a tub costs about £1.49 (so much cheaper than LL equivalent) and is stocked with the gravy powder and stock cubes. It is just the same and no-one I know who uses it says it knocks them out of ketosis if you stick to one or two teaspoons a day in a mug of hot water. Helped get me through months of LL when I wanted something hot and savoury which was not a pack/tea/coffee.
My one box of savoury drinks has lasted me 8 weeks, I just use them if I am really desperate. Sometimes I can stomach them, sometimes they make me go green , its not that they are disgusting or anything (its just my taste changes from week to week), I can't even stomach the soups at the moment. Never mind, its all working out just great! Angela x