The replacement glass is Lexus glass, which I was quite surprised with as the last time I had new windscreen on IS200, it was Pilkinton. I suppose because its so new, Pilkington haven't made one for the IS250 yet.
The adhesive is not on the inside, its on the outside of the pillar on the paintwork. Is this easy to get off?
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I have a mate who works for RAC who has ordered original Lexus glass for my car. You are completly within your rights to have Original glass fitted although they don't tell you this, you may have to wait for it as they won't carry it in stock. As he said if you buy a 22K car you want the best parts fitted to it.