They’re really nice, was a good swap for my advance BUT when I got them I pulled both the membranes out and I found that the original Nintendo ones had a better stiff feel to them. This could be down to older silicone but it was a bit noticeable but I digress. I would recommend these and will be back for some more :)
Game Boy Advance Silicone Membranes / Button Pads
They’re fine. A bit mushy compared to the stock membranes.
These are nice replacement pads. Mine are a little stiffer than the originals, but I actually prefer them that way.