I remember seeing info about XBAND in hardcore (import) gaming magazines like GameFan and Electronic Gaming Monthly, but hardly any info in more mainstream mags like GamePro. Never heard much of anything in Nintendo Power, but it’s a glorified first-party game ad vehicle.
There's an excellent retrospective on YouTube about the xband and how it was built. It was a product ahead of its time.
For example, the way they got games that weren't built for laggy multiplayer to work was unbelievable: they recognized the cartridge and patched the code. Yes, that means every game that worked was a result of a custom built patching of that game's code at run time!
That’s a great video, thanks for posting it. I remember hearing it was similar to how a Game Genie worked, but that’s a lot more work than expected. Very impressive for 1993-1994.
https://en.wikipedia.org/wiki/GameFan
http://www.hardcoregaming101.net/gamefan/GameFAN.htm
https://archive.org/search.php?query=GameFan
https://www.polygon.com/2014/9/29/6867993/egm-electronic-gam...
http://alifewellwasted.com/2009/01/23/episode-one-the-death-...