I just ordered the Vtube mini from Apollo and I'm waiting to see how I like it. I don't have any carto's to use on it so I was going to try some clearomizers that I haven't been using. We'll see how it goes.
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I am here: http://tapatalk.com/map.php?g1oh3o
Don't judge your mini by how it performs with your clearomizers, unless they are about 3ohms. The clearomizers I'm using are 2.2ohms and the V-tube is limiting my voltage to just over 4V.
You need 3-3.5 ohm cartos to get up into the 5V and higher range. That's where the V-Tube comes to life.
If you want to experience 6V vaping, you'll need 4ohm cartos.