I have been using my zmax pretty much exclusively at 8 watts in rms mode. If you go to youtube and look for pbusardo's review of the sigelei zmax he explains how to get to and use the different functions. I use wattage because it doesnt matter the resistance of your coil head it automatically adjusts. For new juices i start at 7 watts and adjust up from there till i am comfortable regardless of delivery device. I have been extremely pleased at 8 watts on pretty much everything. Sometimes i go up sometimes down depending on how i am feeling and what i want out of the vape. Watch pbusardo's review and that will answer all of your questions about settings and ease of use.