I was never able to get this to work but seems good
For MegaChip - 2MB Chip Memory Adapter
This could use better documentation, like that the VBB resistor is attached by default, when in the docs for the project on github it seems more like an option that one would not expect to be mounted on the board.
I was never able to get this work or the second one the seller sent later. I believe the seller that it does work, but neither worked in my Amiga 2000 with a known working (and subsequently retested) 8375. It didn't work with everything removed from the system except the 68k. The only unusual thing about my system is a factory-installed mezzanine in the RAM area which should not matter. I tried seating and reseating both the adapter and the chip. Tried every combination of PAL/NTSC jumper on the motherboard (which should not matter).
The maker/seller is very easy to work with. Again, I believe this is a legitimate and well-made product 100%, but for me it didn't work.
