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Vixen porta is great with the ED80, the short knobs can be replaced with the flexible ones if you wish, I have both but after initially using the flexible ones I have reverted back to the shorter stock items.
The GS clone mount looks similar and although the legs are more sturdy, overall I believe it isn't quite as rigid due to the length of the mounting arm.
The friction isn't an issue, I've never had to adjust mine and provided your OTA is balanced correctly friction isn't used to hold position (the ALT axis is perfectly balanced, unlike the AZ3 which has the OTA positioned above the ALT axis and tends to overbalance.
Because of it's design the Az3 relies on friction to hold the OTA in position. I bought an AZ3 before the Porta's became available, I found it unusable with the ED80 due to balance issues caused by the poor ALT axis positioning.
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