Are cheap Amazon projectors under $150 actually worth it?

It depends on expectations. TechGearLab's high-trust testing found units like the TMY mini and Happrun H1 to be very dim, but r/budgetprojectors threads repeatedly say models like the Happrun H1 punch above their price in a fully dark room. For occasional movie nights in a dark space, the consensus is yes; for daily use or any ambient light, reviewers recommend stepping up.