So I've been stressing over this for a year and would appreciate feedback. I've an S85 now and of course love it... But I'll be selling it to get the X. Got a low X reservation and need to decide soon about getting the PX or the standard X. I've got a teenage son who will be coming of driving age soon and who of course wants me to get the PX. I want to get the PX myself altho worried about my own speeding tickets, etc. But what I'm really worried about is that my son will kill himself (or others) with ludicrous speed. He is a very responsible kid, but a risk taker, nonetheless (like his Dad). My teenage daughter (older than my son) thinks I would be an idiot and a bad parent to get the PX - She rightfully points out that even our standard S85 (Tessie) is crazy fast and that her brother would be tempted to use the PX power in dangerous ways. She also thinks spending $30K for more power is just stupid, stupid, stupid. She, however, is not a car aficionado like my son or myself. Have any of you other Dads wrestled with this dilemma??? One friend suggested I just keep it in valet mode when I'm not driving, but I don't think that's practical or very respectful. I really am torn up about this... He will be driving the new X sometimes.