We recently switched from magento to shopify and ran our first crowdfunding campaign with Fundlify. The app made it very easy to set up, monitor, and communicate during our crowdfunding campaigns. Overall the app is excellent but could be even better with a few improvements.
Pros:
1. The app duplicates your existing products to create campaigns which makes set up very easy. The settings are perfect so the app can track your campaigns sales without interfering with regular products or inventory.
2. you can create collection pages easily for grouping your products/campaigns together. There are quite a few good layout options built in for collection pages.
3. setting duration and availability limits on campaigns was very helpful for us.
4. ability to tag orders as "crowdfund" to distinguish from regular orders. Where the app could improve:
1. ability to save a draft of a campaign before launching it.
2. ability to duplicate campaigns
3. Flexibility to make more changes to the campaign once it's launched, especially duration and available quantities
4. ability to add more than one product/campaign to the cart

If I could give zero stars, then this plugin would deserve zero stars, so unfortunately I have to give one star. The plugin has several bugs that I have pointed out to the developers. I was put off that these errors will be fixed sometime in the middle of the year, but you can't wait for that, because this plugin costs money every month.
Here are the reasons for my rating:
- poor Internationalization and localizationes support, it is not possible to translate the plugin, only some messages can be edited
- few possibilities to change the look of the collection and product page to fit the look&feel of the theme
- loading times of the collection and product page are increased, because the content is loaded via fundlify's servers
- unattractive effect on the product page, first you see the normal Add-To-Cart buttons, after that the fundlify controls are loaded afterwards
- images are not responsive and are partially distorted or cropped
- the support is not useful at all all in all it's sad, because the plugin has potential in addition to the developers reply:
i don't have any other plugins installed, so thats not the reason for slow loading times. my images are optimized through tinypng and photoshop, so don't tell me how to upload or edit images. It would be honest to admit that there are still some construction sites in the plugin and that some design decisions are rather poor. Instead, flimsy reasons are brought forth. Speaking of the lack of localization and internationalization in an online store, this already shows that no thought has been given to the topic of ecommerce. this is my feedback and if you are unhappy with it, go and put some effort into your plugin and fix all the things mentioned.

I love this app. It has really helped me launch my new product. I have been able to generate $20K + in sales and it is just me posting about it on the internet. Without this app, I wouldn't have been able to generate this kind of revenue. I will be a long time user and will continue to use the app. It's great.