This is an important criteria in assessing the quality of a shopping cart plugin. You need to know who’s actually using the plugin. Are the users creating successful online stores that actually have customers? You’ll find out right here.
You can click on the name of the product below to view its full review.
A partial list can be found at the Cart66 showcase.
Many online stores are using GetShopped as you can see in the showcase. Famous brands such as City Surfs, Icon Dock, Pedal Play provide an excellent demonstration of the features and theme design of GetShopped.
There are many online stores using Jigoshop. Some notable ones are - littleblackdress.co.uk, ameliapresents.com, collettecostello.co.uk. You can find the complete showcase of sites using Jigoshop here.
The stores using Market Theme are varied and interesting. GreenGiftsGuide.com store is one good example of a merchant who's using Market Theme successfully. I also like AquasanaForLife.com, though it's an affiliate site -- not exactly a shopping cart.
MarketPress is currently powering many small online stores. You can see here some examples of sites using MarketPress.
The showcase page for Tribulant Shopping Cart lists more than 50 sites that are currently using the plugin. However, I've gone through most of them and they seem to be dormant without any activity.
Some brick and mortar stores use YAK to power their online shops. Take a look at these sites: Jenny Mills Jewellery Shop, 52Teas.com, NQA.org, Rebecca Roth Jewellery, Kipp Abresch Studio, and ManTeas.com.
DukaPress is a popular plugin among WordPress users. It has a high rating on WordPress.org and people seem to love it. But most of those using it are small shops that don't look like they're making any sales, to be honest. You can take a look at the showcase here.
I couldn't find any examples of people using wpStoreCart online.
Although not yet mainstream, below are some of the sites using TheCartPress.