These products have been great to me and my small business; I use the magnetic build plate system on the Elegoo Mars 5U, Saturn 4U, Saturn 4U 16k, and the Wham Bam flex plate for the Bambu P1S.
While it's true what other reviewers say about the magnet breaking down over time it has not effected my prints and has not needed to be replaced or serviced in over 18-months worth of continuous use.
Shipping & Handling is always smooth and customer service prompt.
If you're on the fence about this line of products... don't be.