We had the angel care monitor with the sensor pad and I wouldn't have been without it. It meant when DD transitioned from Moses basket to being in the crib in our room I could rest a bit easier downstairs knowing that it would pick up if she stopped breathing. We still use it now without the sensor - sound only. We can't hear DD crying out over the sound of the telly when we're in the living room at night so having the monitor means she's not left screaming on the odd occasion she wakes up after being put down.
I decided against a video monitor as it would probably have been too much of a distraction to me getting anything done when DD was wee as I'd have been glued to it worrying why she was doing or not doing something or just admiring the cuteness!