I have the $200/month version. Deep Research arrived this morning.
So far I tried it on one problem and it seems limited by the "front end" being 4o-mini. It ignored most of my initial prompt and also ignored the previous research it asked for which I provided. The final output was high quality and definitely was enriched by the web searching it did, but it left out a crucially important dimension of the problem because it was unable to ingest the background info I provided adequately.
I'd like to see a version of it where the front end model is o1-pro