Certainly Craig, $700 is one or more nice eyepieces - so you ask a very valid question. I started with push dobs so I added an Argo Navis as soon as I could, based on the number of recommendations I saw. I was able to buy all secondhand so it was an economical investment. I can tell you that it does just what I need and does it marvelously.
I have also recently obtained a secondhand AutoStar 497 and DS motors which I have fitted to an EQ5 mount. I still don't have it working well. I haven't got good alignment, nor functional goto as yet. Having motor drive is an extra complication in the system. Compared to getting the Argo Navis up and running on my dobs, this has been a pain. I guess a goto system, working correctly straight out of the box, is a different matter. So I am in not yet in a position to compare the Argo Navis push-to with a different goto system.
I can tell you that the Agro Navis is an elegant and robust piece of equipment with a very simple but effective human interface and the best customer support I have seen of any astro product.
But, $700 is a couple of nice eyepieces and if the SynScan aligns the scope well and points it at the desired object then tracks it - well....... you decide.