Eric, did you try to use it at the normal voltage (that you use other cartos)? I found that the VN has to be used at a much lower voltage than I'm used to.. MUCH lower. There seems to be a fine line between a good vape and one that is hinting on burnt.. like I might get a good vape at say, 4v but at 4.1 it would start to taste burnt. I would have a real hard time trying to "dial to taste" on these.
I'm on my second "head" and this time I started out at 2.9 and worked my way up. I don't find it awesome.. but it's acceptable I guess.. I'd have a tough time existing on the VN alone. It has been worth buying and playing with though. I'll probably buy more heads and maybe some kanthal and wick to see what I can do. It would be frustrating if I didn't already have gear that worked to my satisfaction. I've gotten a bit bored lately and felt the need to branch out.
I got a big batch of boges in back awhile ago.. and other than being able to taste the filler.. sooner .. I haven't experienced any doa's or burnt ones. I think the growing filler taste is just me getting more sensitive to it.. I've been bottom feeding a smok tech 2.5 single coil carto for the last week and it has been performing and still tasting really good.. I've been impressed with it