Hey wsp2.
Welcome back to the mattress forum 
I couldn’t find much discussion around the specific “Nexus” variant in the forum archive of The Mattress Underground. One long-running thread shows mixed feedback and highlights that some users found it too firm or expensive. That’s, of course, all very relative.
A little scour of the internet suggests that the IntelliGrid system uses a grid-style comfort layer that many reviews say offers strong pressure relief and alignment.
Another company that uses a grid is Nest Bedding (@NestBedding) - you might find their Contour Grid mattress interesting!
You may also want to take a look at Oklahoma Mattress Factory since you’re in the area. They’re a Trusted Member of our site and are very knowledgable in what they do!
NikkiTMU