I visited in 2019 just after it had been inscribed although the signs still didn't have any UNESCO logos. It was in English though, and well written, all that matters. There are many locations by the way. I stayed at a small place in Atashkadeh and had the Ardashir Palace just next to me but on the day of arrival it was too late - I saw it in the dark but why I would bother to check out shades. In the morning it was a good time to visit. In retrospective I may have added more of the sites on my journey but I don't find these too interesting. It was free and unprotected but for the flimsy gate. It may have better protection now but it's also in the middle of nowhere so nobody really "threatens" these. I think no maintenance is more of a hazard.

The main view was the domed hall. It has not much decoration and your main attractions are windows and doorways. It looks dull, yes, so do more research to understand why you are actually visiting. This surely isn't Persepolis!

You can see this place in 30 minutes easily which is why I was staying next door and had a quick look. Maybe the other sites are better but I doubt it. I could also do more research on this but we already have an academic review by Solivagant so please read his for more insight. Add this on your trip if you are driving through but don't make it a main attraction. Shiraz and Persepolis aren't too far away so I'm quite sure you'll be in the area anyway.