PCT is a great program.
So far I did the following:
Total: 509 exercises done.
I intend to do at least one unit a day per area and as much tactics as I like.
The endgames are going terrible. I just hang on to increase familiarity.
The strategy exercises are sometimes a little questionable. But maybe that's why I'm not a grandmaster:)
The automatic (spaced) repetition of exercises is great!
Margriet has done about the same amount at PCT.