Thanks for that, but unfortunately it is too late! I placed an order for IS300h Premier yesterday without the package.
Although I would ideally liked to have had it, I was quoted a delivery date of January for a special factory order to include it. Instead I went for one without the package that will be with me in 3 weeks. It wasn't just the wait time that put me off. At present I understand that Lexus dealers are being encouraged to get as many IS300hs onto the road as soon as possible, so until the end of September I was offered a deal of their cost + £100 for any car that was currently available or arriving imminently, This saved me over £1,900 from the list price which wouldn't have been available if I had gone for the options package. Effectively ACC/AHB/PCS/LDA would have cost me in excess of £3,400!!
I suspect some of this may have been dealer sales tactics, but I can understand why they want to get cars on the road and the first full sales quarter for this model will end at the end of September so there is almost certainly a grain of truth to it. I was told this by two separate dealerships.
I am sure the package is great and I would have liked to have had those extra features, but with such a feature rich car, I suspect the slight tinge of disappointment in not getting them will soon be forgotten in the excitement of learning the complexities and foibles of both a new car and new brand (coming from Audi).