Jon Kabat-Zinn is a pioneer, THE pioneer of Mindfulness Based Stress Reduction. So, you would be getting your meditation guidance from The Man. He's good. You begin to enjoy the way he phrases things. "...if you care to..." "...moment to moment to moment to moment..." "...like your life depended on it...because it does." "...if your mind wanders a thousand times, bring it back a thousand times..." (In fact, gentling corralling your thoughts and escorting them back to the breath or the sound or whatever, is a critical part of the experience. After all, this is about self regulation.) His voice is the voice I want to hear for guided meditation. He'll give you mini-lectures as he takes you through the practices. It's you and Jon in the confines of your meditation area. You couldn't have a better companion.
I start out a session with a great deal of effort. But as time passes, I can stay with it because I want to stay with it. Intent is everything. At the end, I'm not chomping at the bit to stop. With my eyes closed, I stay with it a little longer. That might be the best part of it. When its time to do another round, I bring to mind that it gets better as it goes along moment by moment by moment. Jon has meditations of various lengths. If you want to meditate longer, a new one will start after the chimes. Life is a series of stresses; that won't change. What will change is your ability to deal with them -- but it will take longer than day or two. It might be what you do the rest of your life.
Before you part with the money, you might want find out what these CD's are all about. I can't say I blame you. Your search of his name will show some YouTube videos of his talks. I'm quite familiar with this one delivered to an audience of programmers, engineers, and scientists at google. (Google must be a great place to work to encourage employees to step away from their work stations and listen to a pitch on a topic quite different from their work. Or, is it?) It's a talk, followed by a guided mediation.
This is not the sort of exercise in which it is desirable that you need to fully understand. That's a needless distraction. Maybe that will come later. So, park your skepticism at the door. Become passive for once in your life and take that leap of faith that this is a good thing to do. After all, it's been around thousands of years. Be satisfied in the knowledge or even the assumption that this has helped millions.