Yes, you can make co-transfection with Magnetofection reagents.

What is the principle of Magnetofection?

Magnetofection is a new efficient physical transfection technology. 

What is the efficiency of this method?

Magnetofection is a universally efficient method, convenient for a lot of cell types (cell lines and primary cells). 

What is the difference between PolyMag and CombiMag?

PolyMag and CombiMag are composed with magnetic nanoparticles associated with a proprietary polymer. 

What happens to the magnetic nanoparticles coated with nucleic acids? Are they incorporated into cells? Do they have cytotoxic effects?

The magnetic nanoparticles enter the cells essentially by endocytosis and pinocytosis.