I got the "CARMEN ELECRA" workout dvd's....are they beneficial? How???

I got those DVDs for Christmas from my husband. I think they're great I've only been doing them for 2 weeks now, but I can swear that I'm more toned and I definitely feel more y. So even if they don't kick your cardio wise they definitely can boost your self -esteem which I think for women in particular is important to our over all health and well being.