I just bought one and have just started to use it on my black rifle. I am impressed at how my groups on the AR tightend right up at 100 yards. I see the 1 mil dot as a 3 dot triangle that covers more than a mil. That could be just me.
Mine is an N battery job as well. Which is fine by me as I have other things that use N batteries. The bad news on N batteries is that the Commissary and PX don't always have them available. The good news is that they do sell them. So, stock up when they have them. I don't Know where to buy N batteries in bulk. More good news is that the N batteries take up less space and weigh less. What you give up to the AAA battery jobs is the length of time the batteries are good for and the cost of the batteries. But for me the space on the rail, the lighter weight, and lower cost of the N sights win out. You can buy a lot of N batteries for the difference in price.
One last point. I went to the EOtech web site. That is were I found out about the Busnell Holosight. So, I speculate they are the same basic systems.