Once you get one of these they really do just live in your bag. Or at least that happened with me - I bought a more natural pinky tone. Have found that in terms of colour it's great on its own, but can also be mixed in with other colours to either darken or deepen the shade.
The only downside I see (well really feel) is that once I put it on it feels plastic-y/waxy on my lips. So I do have some concerns about whether it's harming the moisture of my lips (even though it's a balm).