Sonic Gems Collection for the gamecube and ps2 is a surprisingly fun collection of retro sonic games. It includes games such as Sonic the Fighters (arcade) and Sonic Triple Trouble (gamegear). A must have for Sonic fans.
Long as it keeps going with Sonic the Fighters, SOnic CD, and Sonic R, I am ok. Overall, if you're a Sonic fan, this one is a good investment, lacks a lot of his greats, but for the hidden gems, I like it.
In other words, if this sort of thing matters to you, if you still can't bear to unplug your Dreamcast, and you do own "Virtua Fighter 4" and all the others and think they're brilliant, this is for you.