Sean's workouts are designed for any fitness level - really! He's got a great "perceived exertion" system that's divided into four levels, with Level 1 being recovery, and Level 4 being the hardest you can work. You decide, by how you're feeling, what your levels are. He never tells you to run a certain speed or set resistance to a certain level. That's your decision.
His workouts are also based on the interval training concept, so after every hard push, he gives you time to catch your breath. There are a few of his more recent workouts, like Vol 8, where the intervals are longer, but I really think you'd be able to work with just about any volume that interests you.
He gives a complete breakdown of each workout on his website. It tells exactly how long each segment is, and what he's doing - climbing, sprinting, etc. There are also some audio clips, so you can really check them out before you buy.
I think you'll really enjoy Cardio Coach. But then, I'm a hardcore fan, and I think everybody should like Sean!