Well after the whole drama with the website design, I'm not overly optimistic about the design of a complex trading system probably created by whoever made the current ActM website.
I think the best option would be to go direct shares (though it makes liquidating shares more difficult), and hire someone to manage this if required.
You've seen this, right?
http://mpex.co/LOL. I think we can at least hit a slightly higher mark than that.

I meant more about the technical design rather than the graphic design. A trading engine with robust security would be quite difficult to engineer I'd imagine, and I'd like to know more about the development of this site before we all jump ship over to it. It's good forward thinking, but the site also has to be extremely secure as we're dealing with finances, and there has to be some concern given to whether this solution would change anything at all for US shareholders.