I have a decent idea of where to look to find comp information for a given municipality. But there are a lot of Chicagoland suburbs and tracking documents down for all of them would have been a chore.
Deep Research was valuable. But it only did about 60% of the work (which, of course, it presented as if it was 100%). It found interesting sources I was unaware of, and assembled lots of easy-to-get public data that would have been annoying for me to collect that made spot-checking easier (for instance, basic stuff like the name of every suburban Village Manager). But I still had to spot check everything myself.
The premise of this post seems to be that material errors in Deep Research results negate the value of the product. I can't speak to how OpenAI is selling this; if the claim is "subscribe to Deep Research and it will generate reliable research reports for you", well, obviously, no. But as with most AI things, if you get paste the hype, it's plain to see the value it's actually generating.