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I have used AliExpress for some small things, non astro related.
For something like a mount that is available locally through dealers, I would never.
First, you need to consider the extra fees you will get charged: shipping, 10% GST, custom entry fee ($88) and there is also sometimes another fee I can't quite recall right now.
But beyond the initial cost, the issue arises when you need to do a warranty claim. Say 6 months in you have a problem with the mount, what then?
No Aussie dealer is going to process that claim for you if you did not purchase from them (rightfully so). So you are left to try and contact the seller on AliExpress - who might still be there or might not. Then have to pay for shipping back to them and hope they fix the issue for you. You then need to also hope they do the customs paperwork properly on the way back to Aus, so you don't end up paying GST again! But again return shipping to be paid.
All in all, so much risk and potential cost ,I think it's not worth it for something you can purchase locally, especially on a complex product like a mount.
Now, for some of the mounts you have mentioned that have no distribution locally, then it's a different thing since you don't really have another option.
That being said, while harmonic mounts are cool and all, I find them quite expensive. Sure they give you the benefit of no counterweight and shaft, so more portable, but you do loose on the guiding accuracy and end up paying quite a lot more for the privilege! For instance, the best price I can find for HEM27 with ipolar is $3,150 (no tripod - that an extra $500, so total $ 3,650) and this has a payload of 13kg.
Compare that to an iOptron CEM26 with a payload of 12kg and a price tag of $2200 inclusive of the tripod, case and iPolar! That's a much better bang for buck IMO. Sure the mount is a bit more bulky, but not by that much.
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