I'm looking at upgrading from my iTaste VV 3.0 because I'd like better battery life and I already have the new 2014 model NiteCore D4 Intelligent charger, as well as a few 18650 batteries that I use in my modded Surefire E2D-LED flashlight. After reading this thread, It looks like this may be the choice for me especially since I want to be able to use my 18650 batteries and to keep the length as short as possible. If i'm not mistaken, the 5-1/2" length of the Vamo V5 is one of the shortest setups that use that battery. Other contenders were the Sigelei Zmax V5 but that dang thing is over 7 inches. I may bite the bullet and go with the Sigelei 20Watt since it's 5-1/4"... but i'd like to avoid spending that much.
If it's anything like the connector problem that was frequent on the eGo-T batteries, I found out that there was enough slack in the wire going to the center pin to pull the pin completely out, desolder the wire, slide in an uncut rubber gasket, resolder the pin, and press it back down into the connection. I'm not sure how much slack these Vamos have, perhaps someone has experience with taking one apart that can help.
Not sure the Vamo is any shorter in 18650 mode.
And I doubt the flashlight batteries have the right current curve for vaping use. Some just can't handle the current safely. Check the specs before using them for vaping.