I have several advanced Leslie dvd's (four and five miles) and I really like them. Looking at the overall number of calories that I burn when I use these, according to my GoWear Fit monitor, as well as the number of steps I take, made a believer out of me.
It's true they are not "intense" in that there's no jumping around and comparatively little impact, for the most part, but that's actually exactly what I'm liking about them at the moment.
I think they are are a great add-on for days when you want to amp the calorie burn a bit but not kill yourself, and they're a solid, knee-friendly cardio option when the weather is bad.
The other thing I like about them, as an experienced Cathe exerciser, is that I can ramp them up or down according to my needs/mood -- making them more high-impact and intense on days when I'm in the mood for that,
and less intense when I just want to burn simple mindless calories. There was a thread a while back about how Leslie dvds are adaptable/flexible in that way.
And there
is a mindless quality to them (essentlially she uses just four really basic moves) which allows me to turn my brain off and just move. I also make ample use of the "music only" option on days when I don't want to hear Leslie's chatter.