Great choice if you're on a budget
It has definitely improved overall image quality from N64 and GC (I haven't tried it with SNES) when compared to the AV cable. I've had to connect it to a power source in both cases. It greatly benefits depth of field in games like 007-GoldenEye. However, it has messed up a bit of the celshading in Tales of Symphonia. Overall, a great option. Recommended.