It sits a little too upright and the lumbar support sucks. Installation was easy, just had to drill two new holes to mount the rails to the seat, and enlarge two holes my 1mm each where the rear of the rails bolt to the floor. The seatbelt was a pain. The buckle is attached to the seat and not the rail. Luckily I got a stalk with the seat, so that is now mounted to the tunnel with the original mount point. I think the stalk is too long but I can get that sorted out.
But, is it a viable option to add a few washers between the rail and the seat/floor to lift the front of the seat a bit? Or is that a big no no?
It was raining this arvo, so I haven't thrown the car around much yet, but the seat is good in the corners. Just a little uncomfortable. I found a nice pillow to try for lumbar support

It's hard to tell what the sways did though as they were added with the rollbar, and a pair of new tyres a few weeks back that I'm still adjusting to make it even harder.