I've tried a lot of CDNs before, including AWS CloudFront (which is very high-quality, but also very technical and does not have transformations, etc.). Cloudimage has a lot of the essential tools and the pricing is reasonable for any business size.
Cloudmage is really helpful if you are looking for a solid speed optimization plugin. It helped me reduce the website page size by over 50%! The process was fairly simple and didn't require any technical knowledge. The support team was more than happy to address my queries.