Out for me.
I have no desire for us to be part of a so called 'union' when it's abundantly clear that the advantages no longer serve their original intentions. The EU has become a sinkhole of red-tape with the larger nations constantly embroiled in power struggles. Of course Germany and France don't want to us to leave - why would they?
Whilst we remain they have far more chance to manipulate issues for their own self interests. So do we, but the problem is that they're better at it than us, due to our ongoing reluctance to put our foot down for fear of upsetting the other leading economic nations.
When our own PM lobbies for Britain to be able to opt out of having a 'closer-union' with the EU, yet purports to be in favour or remaining in it, it hardly fills you with confidence. When the US president makes a sound-bite that Britain should remain in the EU, yet this would be the last thing in the world he would advocate for his own country, it hardly fills you with confidence.
Cameron went cap in hand to the EU asking if we could have a proposal that newly arriving immigrant workers would not be entitled to non-contributory in-work benefits for a minimum of four years. Something which makes sense for our economy. Did he get it? No. It was blocked by strong opposition from four central European countries, one of them being...surprise surprise, Poland! No shit Sherlock. He was also shafted with his proposal to stop migrant workers sending child benefit money back to their home countries. No surprise there either.
The issue of migrant workers and immigration is only a small part of EU commitment, and many of those that are in favour of remaining in the EU often use this as a counter-argument, by suggesting that the people who want out do not really understand the full implications of EU membership and focus too much on migration and similar issues. It's the typical 'ah, but you don't really understand the full picture' response.
I disagree, and suggest the migrant worker example above indicates precisely why the EU does not function effectively. 28 member states each having their own agenda, and each having a major impact on other member states (irrespective of their individual economic position) is one of the most stifling things I can imagine.
The fear of trading becoming more difficult if we were to opt out isn't enough for me to want to remain. There are already excessive regulations imposed within the EU which restrict competitiveness and increase administration, therefore the idea that it's much easier trading whilst a member of the EU I find quite hard to swallow.