I own all of them and keep an accounting of the calories burned in all my workouts. I'm at I would say a low-intermediate level of fitness at the moment, at a reasonable weight with some small level of muscle definition, and I'm 45 years old. I've been doing Jari Love workouts for about eight years or so, and have been doing similar workouts for over 20 years. Here is how I would classify the difficulty level of each one, based on my own caloric expenditure, from most to least difficult:
1. Get Ripped 1000 #3
2. Get Extremely Ripped
3. Get Extremely Ripped 1000
4. Get Extremely Ripped Extremely Ripped and Chiseled
5. Get Extremely Ripped Body Rock
6. Get Extremely Ripped 1000 Hardcore
7. Get Extremely Ripped Revved to the Max
8. Get Extremely Ripped Boot Camp
9. Get Ripped & Jacked
10. Get Ripped 1000
11. Get Extremely Ripped Lean Machine
12. Get Ripped Express
13. Get Ripped in 6 Minutes
14. Get Ripped Slim & Lean
15. Get Ripped to the Core
16. Get Ripped & Chiseled
17. Get Ripped (original)
Now, one thing to note is that her original series is almost entirely "slow and heavy" without much in the way of cardio. Any of the workouts that integrate cardio have a higher calorie burn. Also, my list above is based on doing the entire full session (usually 60-70 minutes) rather than premixes, which exist on all the series except the ones labeled "Get Ripped" (that is the original series). Everything from 1-6 burned at least 400 or more calories for me in a single session, 7-13 were at least 300 calories, and 14-17 were between 200-295 calories. So even with the "easier" ones, you're still burning a lot if that is your goal. You can also make all of her stuff easier or harder based on your weight load. I don't lift very heavy (these are all tracked at using between 1-10 lbs. for everything), so if you lift heavier, your results will vary. I also can't do extremely high-impact cardio, so I often modify down if she's doing something very frenetic. Again, if you push it all out, your results will be higher than mine.
I hope this helps! I honestly love them all, but if you do a JL rotation be ready for a lot of repetitiveness of music, moves, and style of workout, so even though I think her approach is fantastic and gets good results, doing too much of her in a row gets me reallllly bored and I need a break.