I got the 18-way sports seats because at the time I ordered the car, there were no performance seats available to try sitting in.
I think the sports seats look great... but I don't find them to be terribly comfortable no matter how I adjust them. They are just, I don't know, kind of hard, not very supportive, and they don't go down low enough. Its probably nothing I'd ever notice if the IPace was the only car I drove, but I also own a '13 Ford Fusion, and the ford has spectacularly comfy seats. Maybe some day I'll be back at the jag dealer and try sitting the performance seats just for comparison...
I've gotta say the leather in the jag is like two steps up from the ford though!