Peter could speak more authoritatively about this, but from what I remember, the DisplayLink adaptors did just use normal drivers as far as the OS was concerned. The only risk of breakage on a Mac would come with major updates to say 10.7, but minor updates should be fine. I was using one of the adaptors back when 10.5 was out, and no system update ever broke it. I had retired the system before 10.6 came out, but would have expected it to still work since 10.6 remained mostly the same as 10.5 as far as display drivers are concerned.