The first resellers in the US are stocking the GuliKit SD02 sticks as of today. See e.g. ASIN B0B31STJDH on Amazon US and a few vendors on eBay.
Hall effect sticks have a following, as they do not deteriorate like potentiometer sticks (which is the stock Steam Deck sticks), and can maintain a small inner dead zone for long periods of time. But the GuliKit SD01 sticks is known to have a outer dead zone problem due mismatched voltage with the Steam Deck. There are no hands-on report with SD02 yet, if the issue with the outer dead zone has been solved.
There are also some fighting game communities with flicking stick moves that swears by potentiometer sticks, due to its friction.
First report (from someone claiming being one of the first to order via AliExpress) on a Steam Deck Discord indicates the SD02 revision suffers from the same outer dead zone problem: https://ibb.co/0JN1x1R
That’s really disappointing, thank you for sharing this.