Count me as a Casio fan. My Casio approval is, however, price dependent.
My first piano was a Privia PX-310. It was already a couple of generations out of date when I bought it in 2015. It played well. It's sound left something to be desired. I remember purchasing midi cables and a midi analog to digital converter so I could plug it into my computer and begin my Pianoteq journey.
After a year or so, I decided I could benefit from an upgrade, and a Yamaha P105 entered my life. It turned out not to be a the upgrade I first thought it would be. The action was stiff and sluggish, though the sound was better than the Casio sound. I soon parted ways with the Yamaha and returned to Casio. But this time, I selected a modern, recent vintage, Privia PX-760. I paid $500 for it (it was a store return, substantially discounted).
The Privia PX-760 was the best bang-for-the-buck piano I had up to that point. It sounded better than my old PX-310, played well, and was very reliable. During the couple of years I had it, I had frequently business with a local church that had a Steinway D in one of its practice rooms. They were very friendly in letting me play it on the days I was there. I had no trouble adjusting to the action of the Steinway D. On the other hand, I was mesmerized by the dynamic range and fine control the Steinway offered. In this regard, the Casio was a far, distant, barely recognizable cousin to the Steinway. However, my Casio trained hands could play it without any disturbing struggles to compensate for the differences.
Sometime after I left the Privia PX-760 for my current Kawai VPC1, Casio introduced the PX-S1000 and PX=S3000. I played one at the local Guitar Center and was underwhelmed. I even thought it might have been a step backwards form the PX-760 I had loved so much. My memory is not too detailed about that trip, but i think I disliked both the action and the sound of the new offerings.
So, I am short on useful details about these newest Casios. But, I am quite comfortable saying that for someone Who is constrained to the under $1000 market, it would be wise to go look at the Casios. They have a history of serving that segment of the market very well.