They focus on FTP and percent of FTP way too much - I don't buy into the lactate training based on % of FTP levels.

You have 3 basic energy systems that you gear your training based on ... sprint/ATP, Aerobic(fat/glycogen), and Lactate in the middle and most everything we do is a combination of the three and playing off them in different ways. IMO they key to making your self a better bike racer is how you attack the lactate system, not the aerobic system.

Both AC and Vo2Max are targeting your Lactate system in different ways, although Coggan's AC tends to leverage the ATP/Lactate transition and V02Max tends leverages the Aerobic/Lactate transition. 30/30 workouts are mostly just lactate work, but I would agree hitting from more what coggan would call the AC level for interval one, however by your 2nd set you have not recovered your ATP so it is almost pure lactate and during a one hour madison during your 60th straight set you are pretty much just converting bile to energy and using momentum to finish it up. I have no idea what to call that energy system, but it is something I recommend all cyclist try at least once.

I tend to play with my Lactate transitions a lot during my training - I would consider it the cornerstone of my training. However I tend to lump all my lactate training into one bucket vs the V02Max and AC just to make it simple. Aerobic is the base, and sprint is the peak, but without lactate it is unlikely you will see the pointy end of the race.