After reading about batteries going out and having similar problems myself with certain titles, I'm considering putting games on flash carts.
I was wondering for the people that use flash carts to preserve and play their game library, how well do these things behave and perform compared to the original carts. Have you noticed any big performance issues on games that are supported? This can be for any flash cart for any system before the GBA - so NES, SNES, Genesis/Megadrive, N64, etc. I've read some reviews from various sources, but some of them are inconsistent with the specs on the flash cart websites. For example, the retro-duo for the SNES contains an incompatibility list, but I've read reviews telling that all these games are supported and there's only a few that they can't get working.
Any input is appreciated.