I have the enthusiast version that can also handle the pre-OBD2 cars (not sure if it's actually OBD1 or a proprietary form). It's been used on 3 cars but still has a VIN left since one wasn't OBD2.
I wish the Durametric was like the VCDS (formerly VAG-Com) from Ross-Tech. No limit on how many cars can be connected to it (may have changed on newer ones) and it can do much, much more. Alas. I have both and I'm very glad for that.