I'm new to vaping and started out with Juul but got pretty tired of the only two "non" flavors they offered. One day I tried a disposable sour apple flavor and loved it but couldn't stand how wasteful it was to throw away an entire unit after one use. So I scoured vape shops and the web to find a good sour apple flavor for my reusable pod pen. This is by the far the best one I found. Not cloyingly sweet, just the right amount of tart with a bit of menthol, which is always essential. If you like sour apple but dislike overly sweet juices, this is it.