This is awesome! The original The Fly is a pretty great movie, entertaining in that 50's B-movie, mad scientist kinda way, but it actually still has its moments of creepiness, if you don't laugh at the human-with-a-fly head image of course. But it's totally entertaining (how could a movie with Vincent Price not be?) and would be a great double feature with David Cronenberg's 1986 version for genuine scares and gross out moments.
Original 1958 trailer (kind of a weird one, they were trying to be creative):