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It's great. I find Google better when I'm actually looking for products, though that's partly it's not as good as localizing results. The nice thing is you can just whack g! in front of the query and it'll bump you over to Google. It's fast, nice, no ads.

Lack of history is a pro or a con or both depending on personal preference.

I have been happy with Kagi -- Like that I can change the site rankings on the results.

I've been a happy Kagi user for a few months now. As someone else has already mentioned, shopping etc is often better elsewhere, but for 95% of my search I use Kagi exclusively.