I believe you are talking about the GSO alt azimuth mount?
I had a look at one at Bintel the other day. Whilst heavier duty than the porta mount its simply not high enough to use with a refractor as the eyepiece height at zenith has one nearly sitting on the ground. It would be fine for a mak or small sct.
Another example of what could have been a decent product let down by a simple design mistake.
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