@droidgirl: what it says is that you appreciate the difference between just giving an enema and giving one the best way (in my not especially humble opinion.) Can you point me to this "streamaster"? I'm only finding references to Motorola, video games, fishing rods, . . .
That it's more personal is, imo, the most important difference, but it's also much more capable of injecting with some authority (pressure beyond what a short fall by gravity will impart.) As a recipient, I like the sensation to be vivid. (And before someone raises an alarm about that, hand-generated pressure is not going to be injurious unless there's already a blowout waiting to happen.)