The Caro-Kann defence is common and occurs frequently enough that most chess players should be familiar and study it. From the data, you can expect that White will only have a 45.76% chance of winning, while Black should have a high 54.24% chance of winning. Because of the fact that this opening occurs commonly, and that White has such a low expected chance of winning, it is definitely well worth it to study this variation. You will eventually run into this opening and when it does occur (and you are Black), you should have a significant edge.