I think its all down to your character as to why or why not you would use it.
I'm doing an evil playthrough now with a power mad wizard who is becoming increasingly tempted by powers offered by the tadpole. It doesn't break my immersion at all because its in keeping with this particular character. We all know IRL that many people become tempted by and addicted to things they shouldn't.
By having the tadpole powers present there is obviously a storyline to follow there and I'm curious to see where it goes.
