I'm drawn to ballet-inspired workouts, but I find that many of them move too slowly and methodically for my attention span. Andrea Rogers' Xtend Barre Lean & Chiseled doesn't fall into that category: the pace is fast and energetic. The full workout, a combination of ballet, Pilates, and general toning, runs 55 minutes, but it definitely doesn't seem that long, because you're moving quickly through a lot of exercises. Segments within the workout make it possible to do a shorter session (e.g. skipping the Arms segment shaves off 11 minutes and allows me to fit the workout in my morning timeslot).
The instructor is Extremely Cheerful. I generally find this be a grating trait, but somehow, she pulls it off; perhaps because her exercises are effective and unique. Her Barre segment (23 minutes) has some challenging moves that really get at your calves and your hips; and her Core section (10 minutes) does a fine job with your obliques. The overall workout, though not cardio per se, will keep your heart moving at a good clip.
More reviews here , here, and here. There's a Q&A with Andrea Rogers over on the Acacia site, and her Xtend site is here.