A little expensive? Yes.
But worth it? If your lips need that much sun protection and if your lips are particularly dry, definitely yes. Otherwise, Labello or Lip-ice should suffice.
Also, don't leave it in a warm place, it will melt and deform. Learnt the hard way.
I started using LipSano in the summer months because of the high SPF. But I must say, after a while my lips also became dependant on it. My lips also became flaky.