Keep Circulating the Tapes: Ever wanted to get it after 2004? New copies haven't been released since then, and it is pretty rare to find it. Got fifty bucks if you go on amazon.com? Unless you're a good bargain hunter, that's the cheapest it goes for.
Old Shame: Sega seems to see this OVA as this, since they almost never acknowledge it exists, and as the Archie Sonic comic writers found out the hard way with issue 100, they will absolutely not allow any of the other Sonic continuities to reference it in any way, not even as an affectionate nod.
What Could Have Been: As on the main page, the OVA is actually an unsold pilot for a cancelled anime series; what we think of as Sonic: The Movie is actually two episodes back-to-back, but thankfully they stand well together on their own.