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I use a Celestron, I think it is 12.5mm?, with a double cross hair. The only time I use it is when setting up the GoTo. It makes the whole job a lot easier. Before then I found it hard to determine when an alignment star was "in the middle". Having a double cross hair gives me a "box" in the middle, a single cross hair (like the finder) makes it more difficult to align because the thing you are looking at gets blocked out. Mine has a small battery holder, switch and brightnes control on the side. It mustn't use much power as one night I forgot to turn it off and didn't notice it until the next day, that was six months ago and I am still using the same battery.
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