Most image optimization tools that auto-optimize images end up with low quality images that simply aren't acceptable for our high-profile clients. Imagizer produces insanely small file sizes without the client's branding and marketing teams even being aware! Page sizes were drastically decreased by 40-60% in many cases. Page load times have increased - and the best part is that integration is super simple. They also helped build savings calculators before we deployed so we could get full client buy-in and support. Finally, we did have a technical issue with them on a client site and they were so responsive and took accountability in a way I have never seen before that really impressed me and our client.