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Looks impressive so far indeed. I'm really curious about any increase/decrease in relevance, once there's a significant number of sites indexed.
A few things to note, most of which you probably know already:
Not spidering sites deeply, and only paying attention to the home pages just encourages people to get a different site for each product. Certainly, the more topics your home page covers, the less likely you are to rank well for the specific topics customers will look up. This is exactly what happens in Yahoo and Looksmart, who only pay attention to the homepage. You end up with whole categories full of one-off sites that are obvious domain spam.