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Couple of points. The smartphone solution sounds nice but it has some drawbacks.
Firstly, it would need to be accurately aligned to the optical axis of the scope. This could be achieved using an adjustable bracket, pointing the scope at a bright star and then moving the bracket until that bright star appears on the screen. Secondly, I have my doubts about the accuracy of the methods used in smartphones to detect position. Thirdly (and this is my min point) successful observation is deeply dependent upon dark adaption, I have tried using smartphones and tablets at the scope and the dimming and redlight programs they use still leave the screen way too bright. You could cover the screen but that means that you cannot use the phone anyway.
With the circles and inclinometer system the main issue is making sure the base is securely level. If you think about it, a slightly tilted base will make the alt readings meaningless as you move from object to object.
I have used Argo Navis for a couple of years now and can attest to it's simplicity, ease of use, well though out design, excellent product support ( on more than one occasion I have rung Gary with questions and he has happily answered them and gone above and beyond to help me) and accuracy. You don't have to worry about level bases, the screen is suitably dim, it is flexible and Aussie made!
Yes it is not a cheap solution, but that first night when you set it up and go looking to an object and it pops it into the middle of your eyepice it feels like $$$ well spent.
Malcolm
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