I did try quitting cold turkey but couldnt do it. I think for me its more the habit of doing something than anything.
I've actually cut my nicotine level way down though.
I started at 24mg, which is typical for a 1-2 pack a day smoker and now at 6-8mg.
And yes, the hardware you use makes a HUGE difference but equally so is the E-Juice you use (the PG/VG mix) I prefer 50/50 or 40PG/60VG.
Im using a Provari Mod with a Kayfun Lite Plus Rebuildable currently and love it. It really does make a difference since some flavors taste better at low power and some are much better at higher voltages.
And while the basic pen type E-Cigs do well (have a couple of those too), you just don't have any kind control over the vaping experience with them. They just work thats it.