I'm not an expert on the Vivi Nova, but I've gotta gotta go with the V(ersion) 2.5:
"The V2.5 is totally Updated and has many changes like the AIRHOLE which is now on the connector screw portion that screws onto your device and not on the base like in version 1, it also has a new top base plus totally new coil heads which have been redesigned and the new non leeching tube - Introducing the Updated V2.5 of the World's Most Popular Replaceable Coil Head Tank System. This version has been rebuilt from scratch Featuring the latest production v2.5 heads and NON leaching tubes brought to you by The Vision Team & Gotvapes
The GotVapes VISION ViVi NOVA Version 2.5!
Holding at least 3.5ml of eJuice the ViVi Nova will provide you the convenience of a all day vape with the incredible introduction of screw-on replaceable coil heads which have been updated to v.25 along with the whole unit itself and that easily allows you to interchange between 1.8, 2.4 and 2.8ohms!
The New V2.5 ViVi Nova system allows you to disassemble all parts easily for SNAP cleaning, especially of the atomizer heads. You can also trim the wicks if you desire to your preference.
Other Features of the ViVi Nova System
The ViVi Nova Now utlizes the newer plastic which is virtually impervious to juice leaching. It features a sealed connector with an airhole connector base itself to ensure great draw. Each peice of the assembly was manufactured from scratch and redone to ensure the best vape possible specifically for the ViVi Nova project meaning all parts are specifically made for this assembly (no retrofitting from the Stone series of tanks). The twist-on for the coil head is actually a 510 connection.
The New NON Leaching tubes were made just for the base to ensure elegant assembly and leakage protection including a silcone seal on the top and bottom. The wick is multi-stranded and braided.
GotVapes worked extremely closely with the VISION team on the updating of the product from the start beginning with the original inception of the design idea and then followed up regularly over a period of months with testing and this continued with the version 2.5, They worked hard on this new system and we want to thank them for letting us work with them on their newest creation. Over 250 individual ViVi Novas were tested at the factory and by GotVapes with water, alcohol, pg, vg and mixes to ensure no leaking.
Overview - What you get with the ViVi Nova v2.5 System
•3.5ml NEW NON Leaching clear tank (color metal tubes also available elsewhere in this category)
•1.8ohm NEW Updated V2.5 Coil Head
•2.4ohm NEW Updated V2.5 Coil Head
•2.8ohm NEW Updated V2.5 Coil Head
•Black drip tip (you can use most other 510 drip tips with this)
•ViVi Nova presentation box holding the complete system with cutouts for each ohm coil head as well as the ViVi Nova tank itself. Packaged solidly and safely for shipping".
I'll say this - the Vivi Nova V2.5 is the best thing I've ever vaped on. Maybe the Bulli A2-TM atomizer will change that.
bulli atomizer review steve from liverpool
http://www.youtube.com/watch?v=LkDIud1d7K0
Cheers!