The following post is my opinions on the Vuse.
In all honesty, its another case of a neatly designed device screwed up by bt.
It has a regualting chip in it so the battery always puts out the right amount of voltage, its not hard to actuate the auto switch, battery life isnt bad either.
Prblems that arise are that the cartridge has a micro chip in it. This chip keeps track of how many puffs you take, and adjusts accordingly. This helps prevent dry hits, but I imagine it also affects refilling it. As to the OP, how you got that top cap off without breaking it is beyond me XD The chip also leaves little room for padding, which means reduced juice capacity. I dont like the propriatary "click" design either.
The juice is awful. The taste is indeed rancid, and the nic level is high. Even a 2.4% fin cart wasnt as strong as that vuse. And the fin tasted better! (infact if fin made their tobacco juice in 0, I'd vape it, and I dont even smoke!)
Overall, if you got it for free, I' say its a nice backup device. but thats about it. Another one of those "great concept, horrible executions" imo.