I have both of these videos and they are very different from each other. Both are very good. "Mental Toughness" is 90 minutes of intervals below AT, or not a lot of high-end work. A good video to do during the winter months when you cannot get out on the roads. "Have Mercy" is a 45 minute very intense workout with intervals above AT; short, hard and fast intervals. So depending on what you are looking for they are both good workouts.

I have Mental Toughness and it's pretty good. It's only 90 minutes but it's all quality stuff. I'll use it about once a week during the off-season and cold winter months just to keep my legs moving. 90 minutes is about all I can handle on the indoor trainer. But it is quality and you'll probably like it.