Poor old me has only the IS250SeMM but would love a GS450H SE-L .At this stage in my life the ISF would be just not right.though I would love to borrow one for a couple of weeks:))Maybe if I borrowed a GS450H i would get that out of my system as well.really I suppose I have the best car for me .I did find the GS450 a bit more wallowy on corners but smooth as snakeSh1T