This decision was likewise difficult for me, because of the weight advantages of the LWB and the fact that they feel so rigid, like an integral part of the chassis. They are also beautifully designed. Others have spoken of the advantages of the forced upright position, desirable at the track. I had no experience with these seats until I drove an RS and felt firsthand what others have expressed. However they offer minimal (IMHO) lumbar support, and as a veteran of numerous orthopedic and neurosurgical excursions in my spine, this was a deal breaker for me. Adjustability and generous lumbar support are key for my comfort which is why my order specified 18ways. V200, GR, MT, November delivery at PEC Atlanta.