overall, i'm very pleased that i got my gamecube up and running again after all these years with this adapter. i actually would give it 5 stars just for reviving my gc. IT WORKS - but partially, in my case.

the video output is great!

but somehow i didn't get the sound along - i additionally connected audio jacks (old original stereo av cables) to solve that.

the remote controller came dead. no reactions, no lights (at the end of the remote) came on when pressed. i initially thought it was may be a battery problem(mine came with a battery inside, along with the plastic insert to keep battery separated), so i changed the battery. but still, dead to me. i wanted explore its linedoubling feature but i can't.

so i took 1 star off for 2 reasons above.(thought of taking out 2 stars haha)

****in the end, it does its job, though not in full capacity as it said so, and my GC is revived. yay!

Works exactly as intended and allows for GameBoy Player Compatibility! The hardware is high quality and connects with a "snap" just as you'd expect with a first party device. I had no issues understanding how to navigate the menus using the included remote (batteries pre-installed).

This device allows you to play GameCube games on on a modern television with a much sharper image than using the standard RCA cables or even the Wii's component cables, and it has adjustable picture settings. I immediately noticed a major improvement in picture quality with GameCube games such as Windwaker and Double Dash, with graphics being clearer and edges being sharper. (No additional upscaling device was used.)

I also love that this adapter has full compatibility with the GameBoy Player accessory, allowing me to also play GameBoy, GBC, and GBA games on my 4K Television without losing image sharpness. I'm using a memory card with GBi installed rather than the original GameBoy Player startup disk, which is also possible with the RCA/Component cables, but the quality is much better with this adapter. It took some trial and error as my TV would not recognize the signal when I first launched GBi, but I did some digging online and found that it would work by enabling "Progressive Scan Mode" on the GameCube game that I used to boot the GBi (by simplpy holding down the B button while starting the console on most games). After that slight adjustment, I am able to play all generations of GameBoy games with no loss in quality.

I highly recommend this device to anybody who is looking to play GameCube games (or GameBoy games using the tips I shared above) on a 4K TV!

So first off, this thing is awesome. you get full progressive scan output to hdmi, basically as good as the gamecube can output, which is all that can be asked, but you also get a ton of options to tweak the signal to your liking w/r/t the stretch, aliasing, etc.

but what i really want to add is the fact that after a few months of ownership but about a month after the refund policy had run out for me and having not used it for about a few weeks, i fired it back up to find that one of the color signals seemed to not be working correctly and so colors were totally off for me. I contacted Kaico and they sent a new one out! 3 days later I got the replacement, totally brand new!

it turns out that the problem was on my end tho - and it was my HT receiver not passing through the signal correctly, not the device. if i run it directly to one of the TV's HDMI ports, all is well, when it goes through my Yamaha HT receiver, i have problems :-/ ...this sucks, but it is most definitely not Kaico's problem! Needless to say i owe these guys an adapter back....

I just wanted to leave my 2 cents here tho to say that this company is awesome, their customer service is awesome, and if you have game cube, definitely give this a try. Thanks guys!

After modding Gamecube with a few other things, i realized that i sold my i sold my official component cable a loooong time ago. So i saw that GCVIDEO products are a thing now, and after looking at a few of them, i landed on this kit from Kaico. Theres another one here on Amazon thats fully made of plastic, and doesnt come with the piece to support the adapter. You really need that support bracket. These adapters are a bit heavy for just the port itself to carry, especially with the weight of the hdmi cable as well. These support brackets can be purchased separately, that will cost you about $10 shipped just for a piece of plastic.
The quality of the Kaico adapter is great. Quality metal body, and solid connector. Worked right away. Updated it super easily to v3.1, and my god the picture quality is outstanding! I cant believe its 480p im looking at.

Protip, in case you get any weird audio issues, like becoming out of sync, turn on the "sample rate hack" in the gcvideo settings.

Love this thing.

A little pricey though the price for these things have gone down over the past year or so while the construction quality has gone up, especially considering the first GCVideo device I ever bought had a 3D printed shell compared to the sturdy metal enclosure this one uses. Otherwise, it does what it's supposed to do. Just make sure your display can handle SD resolutions or else you might need to invest in an upscaler as well.