this is how oxydators compare to alt uses for peroxide:
pros:
-no known sensitives. the way the OD disperses the oxygen/peroxide makes it safe. raw peroxide has lists of sensitive animals to consider before use, the OD has no known sensitives at all I know of.
-they have a 20+ yr history you can research, so, nothing new comes about unexpected. they are a German product originally.
-they are fine preventatives for cyano and some types of invasions. they have a pronounced safety factor over using straight peroxide as many currently do.
the only cons are they cannot beat the invasions that require direct peroxide to win, and with that the safety factors change. overall, they are good. you cant put an OD into a wrecked dino tank, or wrecked bryopsis tank, and fix the tank. not strong enough. ODs are intended to be preventatives for invaders that don't use holdfast systems/anchors. cyano is a fine example, OD's really do help with cyano tanks and diatom tanks.
Whether or not they leak/parse out raw peroxide into the tank doesn't matter, they are safer than raw liquid. large threads exist debating their mechanisms, but only the endpoints above make the difference. The reason I don't use an OD is because I keep a detritus free tank and no invaders are allowed to deposit within the tank. If they were, and I wanted less work, an OD is reasonable to consider.