Yes, it is very worth it. You aren't limited to a vanilla/optifine version of the game as other clients provide.
You can play with your forge mods and have the advantage whether you want to play legit/blatant.
Vape costs an incredible premium compared to other clients because we take pride in our work and are willing to pay to have the best stuff in our client. You won't get the same level of customer support, frequent updates, and actual development anywhere else in the MC hacking community.