What I love- there are no upfront fees, and no monthly subscription costs. If you ship quite a lot of packages, you are missing out by not having a system like Share A Refund to keep track of your shipping. When you've paid for Express or Priority mail, it can be frustrating when the packages aren't delievered in the time frame you expect.
Share a Refund analyzes all shipments on your account, and reports to you when refunds were necessary to be filed. It processes the refund claims automatically, which does same a bit of time. It helps automate the refund process, and keeps you as the business owner invested in the best customer service possible, because it's so easy.
I do feel 50% is a bit high. I'd be far more comfortable at 30%, even 35%. Shipping is already a large cost of running a business, and for those that are late, customers generally will hesitate shopping again when they need something at a specific date, so you've lost money via sales and via the refunds, by losing half of any refund.
I'd also like to see an integration for WooCommerce. It is the backbone for so many emerging E-Commerce sites, it'd be really great to have an integration for it, though they do support Magneto and Shopify. WooCommerce would be just another great addition.