I have this one:
https://www.amazon.com/gp/product/B0861B8JPQ/ref=ppx_yo_dt_b_asin_title_o02_s01?ie=UTF8&psc=1 Extremely robust and so easy to pump.
The build quality is extremely high on this one.
I was basically refunded because the adapter would not fit my AGs' fill probes; it being too deep by approx. 2mm.
The solution was to install an extra O-ring on top of the existing one.
A few days after I got it, there was a sale on PCP pumps for less than $25 shipped---details provided by GTA Bargain Gate.
I bought one as well, no brainer, as back up.
Comparing the two, the GX is miles ahead in construction and aesthetics, of course.
Both come with rebuild kits, btw.
Just clean and re-oil it after 500 pumps to make it last forever, lol!
Silicon grease (Ace Hardware auto section has them) and silicon oil 30weight (can be purchased from RC hobby stores for $6) are all that you need for maintenance/lubrication.
https://www.youtube.com/watch?v=aS3UYp-mvNQ