GET BOTH! The V3 last me about 21hrs straight vaping on the AW P17670 battery, with the ICON I get about 4hrs off of the AW IMR 14500 batts. Both batteries fit the same charger.
The V3 is about an inch longer than the ICON-- when in use it isn't that noticeable-- what is, is the heft of the unit... there's a big diff between the 2.
Vapor production for both are identical straight off the charger, so if you like small performers get an ICON.
If you want to only charge your batt every 2 days or want an occasional 6volt jolt... get the V3.