I'm a paying user and I use Perplexity permanently, and it is very useful for every topic I use it for. While ChatGPT and other AI models have incorporated web search capabilities, from my humble point of view, Perplexity maintains distinct advantages, particularly for users like me focused on research and accuracy. As a pro user I can also select from multiple models, including ChatGPT, but I more often use Perplexity's own models and Claude.