I'll add my .02. We just spent 10hr in a set of PRP Daily Driver's. Mounted to a set of cut down K5 bases. Also running their 4pt harnesses.
Neither the wife or I are nearly as worn out as with the factory seats we previously had. I'm 5'10" around 160lbs. She's shorter and slightly heavier than me. This was the first real use of the seats and they were worth every penny. Spending the day bouncing around the sand dunes before would have us both sore at the end of the day. Having more support and being strapped in tight made a huge difference. The back could be a touch taller for me but not a big enough deal for me to want to swap them out.
FWIW: The pair of these was $1606.64. Options I got were heated, front and rear pockets, upgraded to small diamond stitching. The matching rear was $898.32 with the only option being the upgraded stitching. Shipping was $400 to my door which seemed high for how they packaged them and their weight.