Never heard of PINK before this thread, but I've done the p90x program and my husband is doing Insanity right now. It's tough--he's fit but even he has a hard time finishing sometimes.
Not sure if it's been talked about here before, but I've been doing Bodyrock for about a month and I really like it.
http://www.bodyrock.tv Note-- the instructor doesn't wear a lot of clothing and the camera angles are...motivating, so I wouldn't recommend looking it up at work. Guys especially. ;-) That being said, I love the program. It's free videos online. It's HIIT exercises at home with similar moves to Insanity but only a "12" minute workout. You can repeat them or double up other workouts from the site if you are adventurous--there are like 600+ on there. You aren't going to lose 70 pounds just from that one workout a day, but as part of a cardio/eating clean lifestyle, I'm already seeing results in strength and toning and I sure like it a lot more than p90x. To me, finding a program that I'm excited about and will DO every single day was the most important thing.
Perhaps some fitness peeps here have anything to say about it?
Good luck!