Occasional second person

[Karolina]

I'm open-minded for all the new ideas, but second person really sucks.

[Tabris]

I'm open-minded for all the new ideas, but second person really sucks.

All kidding aside, I've seen it done really well.

[Karolina]

All kidding aside, I've seen it done really well.

Me too. Some French writer combined second and third person, plus mixing present and past tenses, and the book was fabulous. 

[dalgara]

I've seen present tense used very well in asides or when the characters are in a different state of mind. I see all these things as tools to go places we want to go and to get across how our characters perceive the world and their conflicts.