I've taken 2 Beta exams (not the CCP, as I am grossly unqualified), and am waiting on the results from a 3rd, and think that they are absolutely worth it. if you don't need the cert for a job, take them. My exams were $350 each, so for $50, it was a no-brainer. The biggest drawback (aside from questionable test questions because it is a beta) is waiting for the results. My Cloud+ exam was taken in October 2020... the results were FINALLY released earlier this month.
Most study materials involve using the current versions and hoping and praying they haven't changed the content that the test is based on. Take some practice exams, and ensure none of the objectives have changed too much.
One thing I have found (and heard from others) is tests, in general not just CCP, get harder with every revision. So if you need a test for your current job, or for an upcoming promotion, take the existing exam. If you don't need the cert currently, don't have an urgent need for the cert to advance your career, or just want to give it a shot at a discounted price, take the beta.