That seems a really good price for all the items included in the kit but having a look at the linked website the camera is only 380 lines whilst rfconcepts has ones that output 560 lines. Also I don’t think the camera is waterproof.
Its a pity that there isn’t any footage to see what the quality was like. I would want to be convinced that there would be no radio signal interference, if not, its definitely the way to go.