Thanks for posting the link Mike.
I've briefly heard of the Pi finder but the Cloudy nights link explains just about everything I needed to know. Will have to seriously delve deeper into this, could be very handy on the big dob.
I recently got a PiFinder and have found it to be stunningly good. It was nearly a full moon and I was still able to find faint fuzzy after faint fuzzy.
My only concern with it is that I fear as I use it more that I will lose even more of my knowledge of the night sky and ability to starhop…it seems to be that good…