Save the money or take a nightfill position at Woolies for two nights and buy an STi (worst name ever!) or a Lodestar.
The ZWO will work okay and is cheap, but it is worth the extra money to pony up for a Lodestar/STi, you never have to worry about finding a star and autoguiding frustration disappears altogether.
You will keep it forever, whatever scopes/mounts you end up with down the track. Well worth the investment of a few hundred extra.
But if not, then get the ZWO.
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