I have two MVP2's both with Kayfuns on them. One is 1.7 Ohms and the other is 1.3 Ohms. I definitely find the 1.7 Ohms works better and makes better use of the VV/VW range.
Just a small tip... If you have an android device download "Vaper's Toolbox" app, it's free on Google Play. It is an awesome app that you put in what you are using and the Ohms you want and it tells you how many wraps to make! It works awesome and was made by a member here: ScottP!