I'm on my second day with my new V2. I must say that it wasn't ready out of the box, I was getting inconsistant hits. After reading here, I decided to try the o-ring and Naolox. This worked but required a hard press. I then tried rotating the contacts to rounded sides, but this caused things to get worse for me, so I rotated them back.
After doing all of this, I am able to get it to fire now, but again, have to press pretty hard. The rear battery spring also came off. It only took a few minutes of tinkering to get it back on.
I will say that I am a little disappointed, but the design does allow it to be easily worked on. I am going to run with this for a couple of more days and reserve final judgement.....