I haven’t worked with them directly long term, but I did have a strategy call and looked through several case studies from conversion rate store . Their performance-based model is definitely interesting because it reduces the usual risk of paying a monthly retainer without clear results. What stood out to me was their structured testing process—research, hypothesis building, design changes, and A/B testing backed by data. From what I saw, clients reported noticeable improvements in conversion rate and revenue over a few months. If your site already has solid traffic, their approach could realistically generate measurable uplift.