Yes.
Edit: I suppose I should add more detail.
There are posts on here from people last year who didn't take it, and then a school decided to require it in the middle of the cycle. Because the applicant was more than 10 days post-CASPer, they were ineligible to take Duet and Snapshot. This is entirely unfair, but it's the reality. Duet takes about 15 minutes, and Snapshot takes about 10, and neither really requires any preparation. Given that there aren't any additional fees outside of what you already paid for CASPer, it seems that the safest course of action would be to take Duet and Snapshot, just in case a school down the road requires it or you add a school at the last minute.