I don't see any cons with switching.

I follow PP with my own modifications - eating very little fruit and no grains because grains just set me off. The one big advantage is starting and staying at 30 grams until you are close to your goal weight. Lettuce and other leafy greens are unlimited so are not counted towards your daily carb intake. Making a point of spreading carbs and protein out evenly throughout the day helps keep you in balance too.

One thing to note is that there is a restriction of high fat dairy products like whipping cream, sour cream, etc.

I love PP!

Karen