The shopping cart and storefront are some of the worst parts of Infusionsoft!
Maybe I'm being too hard in some ways. If your needs are very basic, the shopping cart does work. It's a good fit for you if:
I think Infusionsoft is aware that their Shopping Cart & Storefront is a big weakness, and they have oriented their marketing toward their strengths in email marketing, follow-up, and automation. It's a shame, really. It's really great to be able to do marketing follow-up based on products purchased, etc.
The limits of Infusionsoft's shopping cart has been good for GreasedSkid, though. We do a lot of project that integrate Infusionsoft with third-party shopping carts like Volusion.