I have been doing Jari exclusively for the last couple of weeks, trying to see if the high-rep lower weight type workouts will work for me. I just got Ripped & Chiseled in the mail yesterday, so I haven't tried it out yet, but I do have the four others. I would say my favorite is Slim & Lean (just did it yesterday!), followed by the original Ripped, the 1000, and To the Core, which contains mainly compound exercises, some of which I found awkward. That one also has a near complete absence of tricep work, which is a little annoying. The only real complaint I have with her workouts is the barely-there ab work. I don't think she holds any ab movements longer than 16 counts. It isn't terrible, but I usually tend to pop out the DVD and finish with a Cathe ab section at the end of the workout.
Other than that, I'm a pretty big fan. Some people find the workouts boring, but I find them soothing and my muscles always end up feeling nice and worked, but without that dread factor that some weight workouts tend to have.