Although the results shown in this case study represent the actual results of a real client, I cannot guarantee the same or similar results for you. Every business is different, and results can be impacted by numerous factors including factors outside of the control of email marketing.
With that being said, email marketing has one of the highest ROIs compared to other marketing channels. If you have a good website, good product(s), and good traffic (or a plan to get good traffic), then I would highly recommend you implement email marketing.