I bought these in several flavours/colours because someone I worked with a couple of years ago uses them and they looked really nice on her. They do give a nice shine to your lips with a hint of colour which is perfect for summery days and days when you don't want full on lippy or sticky gloss.
As a lip balm I don't think they do anything much at all for the condition of my lips.
I wouldn't buy Watermelon again, theres hardly any colour in it and it tastes very fake.
Satsuma Shimmer is lovely, it smells of satsumas and is a lovely pale orange shimmer effect.
Passion Fruit is the best for its nice purple colour and fruity smell, closely followed by Rasberry and Strawberry which both give a nice reddish tint to your lips without being jammy looking.