I do it every 30 days and love it, it's the only thing that keeps my average up. I *wish* i could do it twice a month but they won't let me! I lose more in the week of metaquick and the week after than the other two weeks each month. Also, i love not having to plan so many meals, it's easy.
I actually just finished another round of it and here are my tips:
1) If you can do it, try to use premade shakes ONLY. Not the powders and not the meal bars. If you compare the carbs, protein, etc on the "premades" vs. the powder shakes and the bars you'll see that 2 of the pre-mades are much better for you (lower carbs, higher protein, lower sugar, lower calories) than the shakes or bars. When i do shakes or bars, I have slightly less of a loss than if i do pre-mades exclusively. Oh and I only like the chocolate ones
2) Do the full 7 days. They say you can do 4 and then take a break and then do 3, but to get the most out of it, 7 straight days is more effective.
3) Try to do 2-3 fibers every day, they help keep you full and burn more calories
4) Drink tons of water, many people gain water weight during meta-quick, so drinking extra water will help combat this.
5) Do your exercise, it will help and you'll see the difference in this week.
6) For me, doing metaquick is the only thing that makes the ketosis strip pink. So when you finish your week, you'll be tempted to eat slightly off plan if you feel like it was a really rough week. Remember that when you finish metaquick, your body is in it's most efficient fat burning stage and you want to prolong that for AS LONG as possible, so don't cheat, watch the cheese, and try to hold out as long as you can.
Also, you might not lose much the week of and you'll see the loss the week after, that's how it works for many people. For me, I see a slightly smaller loss both weeks.
Good Luck!