It's painfully slow. I can Google the question, click one of the top results, skip to the relevant part and read it faster than GPT can generate two sentences. You also have to build an elaborate prompt instead of throwing two/three keywords into it.
It doesn't help that GPT is insistent on replying in the three paragraph format, meaning that the first 30-40 words it creates are just trash to be ignored.
I found it useful once - when I had to write an essay about ISO 27001 for college and just wanted it to go away. Took what it generated and spent 20 minutes editing it to look closer to my style. For real work it isn't as useful.