The main thing you want to check with your hosting company is that your database user has “Create View” privileges. This may differ, depending on the hosting package you choose. We recommend 1and1.com as even their shared hosting packages have these priveleges. However, since we're not in control of hosting companies offerings and their right to change them, I would recommend always making that inquiry.
The primary use for eCart with PowerStore would be to quickly and easily change the default payment gateways offered with PowerStore (PayPal Payments Pro, PayPal Express Checkout and Authorize.net) to another gateway supported by eCart. All gateways supported by eCart are listed on the features tab of the eCart page.