This is something that is pretty much one of the cheaper options for a straight forward HDMI adapter for your multi-out Nintendo console. Currently, I only have a Super Nintendo (an SNS-CPU-GPM-02 motherboard revision) that I can test this cable on, so I can't say anything else about the N64 or the GameCube. This is overall decent to use at best. I really like that there's a 4:3 switch on it as well, something that isn't really present on a few of these types of cables. I personally don't like playing games on 16:9 for something that is meant to be 4:3. The overall picture is better to see compared to the original RCA cables as this converts S-Video.
There are three caveats that I have on this HDMI adapter compared the the original RCA cable my SNES came with:
1. It looks like I'm looking through a very faint window screen on my screen that was installed diagonally! For me this isn't too much of a big deal as, to me, it looks like it has that CRT television lookalike when playing on my HD TV and monitor, but for people that seek an HDMI adapter that is more on the quality side and lower cost, with no unintentional filter on it (meaning it has the pixels visible with no "window screen" thing on it), I would say this would be a turn off since the original RCA cables don't have that window screen look on it.
2. Audio output is QUIET. With the current setup I have for playing my SNES, I'd have to crank up my volume quite a bit higher just to make the volume audible to play on. This doesn't happen when I use the original RCA cable on my HD TV.
3. This one is small, but plugging this into my monitor with the USB cable plugged into the adapter makes it turned on constantly instead of shutting off the video signal when it is not in use. My monitor shuts off automatically when there is no video signal, but this one has its own "No Signal" display when it's plugged in with the USB cable, so even though when my SNES is not in use, my monitor would stay on because of it. As a result, I don't use the USB cable it came with since you can use it without the USB cable, even though the people who made this recommends plugging it in for longevity.
Do I recommend this overall? I'd say meh. To say that I am dissatisfied at this would be completely false, however. There are much, much, better quality multi-out HDMI cables out there if you *really* care about quality, such as the RAD2X (although those won't be available until next year, oof). However, I mentioned that I have an SNS-GPU-GPM-02 revision for my SNES, so take my opinion with a grain of salt if you have a different SNES such as a 1-CHIP revision, as you may or may not have a different picture than I do. Overall, this is an okay converter that bridges between quality and cost. If I can give this half-ratings, this would be 3.5/5 stars.