While the CompTIA Security+ exam is a difficult exam, many people look at it as a stepping stone to other certifications. If you stay in the security arena, a next step may be the CISSP ISC2 certification, which is significantly more difficult than the CompTIA Security+.
Several weeks after taking the CISSP exam, I received notification of a successful pass. Woo Hoo!
One thing that was very apparent to me was the information I learned while studying the CompTIA Security+ objectives definitively helped me with the CISSP. The CISSP exam is a monster and will take a lot more time and effort to master than the Security+ certification. However, if you take the time to truly learn the material for the Security+ exam, you'll be a step closer to the CISSP.
As one of many examples, understanding public key cryptography helped with many questions on the CISSP exam. Chapter 9 of the CompTIA Security+ SY0-201: Get Certified, Get Ahead book includes all of the material you'll need for cryptography in Security+ and you won't need much more if you later pursue the CISSP.