Please consider getting this setup in addition to your Legacy. To increase your chances of success, I encourage you to have many options, including variable voltage (or wattage, as with the Kick).
Shameless cut-and-paste: (Not 100% applicable to your exact situation, but mostly so)
"I cannot encourage you enough to bypass constant voltage and go straight to variable voltage. VV will let you adjust the temperature of the coil by allowing you to select the voltage sent to it; constant voltage will not. With constant voltage, you pretty much have to find and stick with a particular attachment (atomizer, cartomizer, clearomizer, whatever-o-mizer) of a certain resistance (in ohms). The kGo, Riva, and Joyetech eGo T- and C- batteries are constant voltage; to date, the only eGo-class battery I know of that is varible volage is the $22 Joyetech eGoC Twist. A simple dial on the bottom lets you adjust the output voltage between 3.2 and 4.8 volts. Wonderful device.
Ohm's law: Watts (heat at the coil) = volts x volts / resistance in ohms; if you can adjust the volts, you can adjust the watts, which often need to be varied toaccommodate different flavors and PG/VG ratios of juices.
PLEASE consider just getting the following, as you explore other options. I have a LOT of stuff, but this is what I use 95% of the time:
Joyetech eGo-C Twist variable voltage battery - 2 x 650mah, 1 x 1000mah
Phoenix CE3 clearomizers - 2 5-packs (About $12 each pack)
Vivi Nova or Vivi Nova Mini tank/atomizer - couple of each (About $13 each)
Joyetech charger - get two (backup, backup backup) (About $13)
Plain old clear drip tip ($2.99 - what a rip)
juice (Get 6ml x # of days before you receive another order + 25-50%)
You're done, and ready to explore other options, if necessary".
THE EGO TWIST IS A GAME CHANGER - YouTube Grimm Green Twist Game changer
eGo Twist from Ovale - eCig Review - YouTube Field of vapor Twist review
Joyetech eGo-C Twist $22
Joye eGo-C Twist Variable Voltage 650mAh Battery
Bulli atomizer review steve from liverpool
Bulli A2-T atomizer from bulli-smoker.com - YouTube