Is the Eufy E25 worth its $100–150 premium over the C28?

Yes, the E25 justifies the premium with WiFi controls, smart mapping, and 1,500 Pa suction versus the C28’s 1,200 Pa — a meaningful upgrade for most people. The C28 is only worth saving for if budget is the absolute priority and you don’t care about app control or room-by-room cleaning.