There has been some variations made to the Vivi Nova, I don't know why, as far as it goes long wicks are considers V2.5, when V2.5 first came out they were advertised with air holes around the bottom cap instead of it being on the connection, but looking at some videos and my friend purchased one there were no air holes on the sides of the bottom cap, I don't know if this was done as a cost reduction scheme or to sell off whatever was left of the old V2 bottom caps, my friend received an email saying that the designed changed due to certain reasons which was never made clear. To me it just seemed like they were trying to get rid of the remaining V2 bottom caps, some come with air holes at sides of the bottom caps, others remain as they were like on the V2s, the only big difference are the wicks, that's pretty much all I have on Vivi Novas.