Sticking to the Sonic game in particular, this was a FANTASTIC time. DC had the best launch ever. I bought this, Soul Caliber AND NFL2K with the console on 9/9/99 and could barely stand that I couldn't play all 3 at once. SA is where I spent most of my time initially, though, and it was surreal. The tornado, running down the building, the amusement park . . . so much wild and crazy fun.
As long as its not too expensive, I'd have a hard time not buying this.