I've recently been down a bit of a sharpening rabbit hole, and ordered quite a few bits and pieces from AliExpress - a £26 clone of a €1,000 sharpening system, some diamond plates that fit the system some larger bench diamond plates for freehand sharpening etc etc.
I did a fair bit of reading and research first.
A diamond plate that came bundled in with the sharpening jig looks a bit low quality but everything else has been very good and exceptional in terms of value for money
(EDIT: I realise that my quality-control approach might sound a bit casual - so, just to expand on that: I'm not an expert, but read up a fair bit. I read that the AliExpress diamond plates were durable and effective, but the one criticism I couldn't test was a few comments saying their plates sometimes suffer from grit contamination - so when my plates arrived, I examined them under a microscope, to check, and found them to be very good - and on a par with the plates on my Work Sharp Field Sharpener, and with images I found on line of diamond plates sold by other well-regarded brands)
What are you after? What sort of sharpening are you planning to do? Freehand? Guided system? If you let me know, I might be able to give you more specific views and opinions.