From what I remember of when I used my OC-2, I didn't mind the tracking. If it gets the tone down, though, I'd be totally happy. Most of the clones a lot of the way there, but there's often just something missing. I'll be interested to try the Subsonic.
I've been somewhat preparing to embark on a soul quest of octavers. Currently, I own an Octabvre MkIII and the Synth Voice Deluxe. They both are useful for their own reasons, but I've voiced my thoughts between the two. I've previously owned various Octabvre versions, but I'm unlikely to be able to get any of those again. I also had an Octamizer, which was nice, but I got rid of it after getting my first Octabvre. I also own a 1986 OC-2... but it needs some work done on it, as it has a very narrow headroom which makes it useless. It's what I used back when I was first starting out.
Currently, I have my eyes on the MXR BOD, the Mantic Hulk, and the EBS Octabass. Maybe the new version of the Octamizer, too. Also interested in the Foxrox stuff. Really, I'm just looking to try different flavors and see what sticks.