I've been fighting off a debate in our team about dual wielding two DE's. To prove my point I asked the person to hit a target at x paces with one DE. That was no issue, now try the other hand! I rest my case
If your close then dual wielding two DE's, your more than likely to hit your target, over distance forget it. The element of luck is the deciding factor.
But out of all the pistols in our team the DE is the most powerful, and excellent range.