Pure products were amazing. I always found the way Quantify represented profiling to be incredibly helpful back in the ancient days. I know there’s more advanced visualizations but I always found the logarithmically scaled directed edges in quantify to speak to me better than flame charts and other related techniques, I think because it represented the full execution graph rather than individual transactional paths. Anyway huge respect for Reed as an engineer and have always been impressed with both Netflix and the quality of the performance, debugging, and other efforts that have come out from them. He clearly values excellent engineering.