I use CS-Cart for my main site and am perfectly happy with it! It’s an excellent product. I can personally recommend it having used for years.
However, for another site, which is just a catalogue site at present, I need something simpler.
- An ecommerce system with a good backend - not necessarily as good as CS_Cart, but allow to add/view/edit orders/customers/products etc.
- A very simple front end which I can just add an “Add to cart” button to existing pages. One I can create a checkout page matching the template of the exiting site.
I would use CS-Cart, but I don’t think I can do #2 above.