What reapers have going for them early game is the cliff jump. Late game they can use their DA charges to great affect becoming the terran siege unit. Put just 5 in you M&M ball and you'll take and enemies barricade down very fast. Photon cannons fold like paper to reapers. Off Topic: If when you train a reaper in reacter it would have to be half as good if marines require a tech lab could they become TWICE as good?