You might be confused between Maxiglide MP and Maxiglide XP. If you will try to scrutinize their features, you can only see that the Maxiglide MP is smaller than Maxiglide XP.
Both come with special features of Stem Burst technology that provides the right amount of heat for easy straightening.
MP is lightweight and more portable than XP.
The MP is $10 cheaper than the XP.
All in all, Vissa recommends is your hair is thinner or short, the MP is better. If you hair is thick and longer, then the XP is the best choice.