The discussion around Perplexity Deep Research reveals a mix of satisfaction and criticism regarding its performance compared to competitors like OpenAI and Gemini. Users appreciate the accessibility of deep research applications, especially in leveraging large language models (LLMs) for summarization tasks. However, there are notable challenges cited, such as Perplexity's difficulty in complex queries that require synthesizing multiple data points, indicating an area for improvement. On a positive note, some users have reported successful results, particularly in generating tables and analyses without the download issues seen in other platforms. Overall, the sentiment reflects a desire for ongoing innovation among AI platforms, suggesting a saturation in big players' offerings.