Depends where you get the compatibles from. Some are good, some are less
than satisfactory. The other thing is you may come across an issue where
your printer detects the compatible cartridge and gives you an error
message. Generally you can go into settings on the printer and turn off
the warnings.
Chip failures on the compatibles are not unknown either which leaves you
with an almost full cartridge that is useless.
Print quality is generally okay. Colours may not be quite as accurate as
genuine though.
I have had reasonable success with compatibles from Aussie Toner.