Sonic Heroes is a game that I have nothing but fond memories of, with hours spent replaying the different team stories, trying to do the special stages to collect all the Chaos Emeralds, etc. It has one of the largest rosters of characters in the series; I already had played a Sonic title prior to this and knew of some characters already, but it introduced me to characters I'd never known, such as the Chaotix (this was one of the only main series titles they're playable in!)
It's a somewhat mixed experience, I can't deny how rough it is around the edges; it's buggy, the story is basic as hell and the writing at times cheesy, completing the game is a total drag to be honest given you need to beat the game at least four times, one with each team, to actually do the final boss. But even having gone back to it more recently and seeing the issues with it, it brought me back to a time where I was lost in the fun I was having.
This game hasn't been available to purchase and play now for nearly 20 years, as it was only ever released for PS2, GameCube, Xbox and PC through retail discs, and was never released digitally on any platform. I love to go back to and play it, but many of those consoles of the era don't work as well anymore or are hard to come by, and PCs rarely support discs anymore. I loved going back to play it, but with time it's become harder for many to do so; the GameCube I used when replaying it more recently does not even work anymore. If this game came to GOG, it would finally be accessible again to many for years to come, something I'm surprised it isn't already, being a title in what was and still is such a popular series.