The old Vixen Super Polaris is a great classic mount, no doubt about it, at all. They were probably Vixen's best at the time, maybe other than the GPDX IIRC.
I have 1 and 3/4 SP's. One has been my main use mount for a few years, and I bought another one minus legs and hub / polar scope for parts if ever needed.
There are a few things to note about the SP I've learned from other folks on here, and some through trial and error myself:
1.) Sometimes you will get one of these, and it will have a bent worm gear - it's fairly common, if you have one of the rigid slow-motion stalks on it... and bang it on a door, or anything like that, it will bend. They are brass, and fairly soft. Just beware, in case you want to add a stepper motor to it later. A bent gear is no fun when trying to add a stepper and it's gears / clutches, but it's usually no big deal if just using the manual slow motion controls.
2.) Stepper Motors - there are two versions of these, the older one being a 5 pin and the newer ones are an 8 pin. 5 pins are usually called MD-5 and 8 Pin ones are MT-1. Also, there were a few different controllers based on the pinout. There were also a few different ratios on the steppers themselves..... all in all, it's a very lengthy ordeal - but most of this can be researched on the internet.
A.) If you get a controller and motor setup for one of these (they can be found on the classifieds here) they are center negative on the power adapter. Make note, and don't let the magic smoke escape.
B.) There are still companies (last I checked) that can build drive systems for these mounts. One is AWR in the U.K. and I think there is another, but I don't recall the name.
Sidenote ~ I had AWR build a dual axis controller for my SP and 1/300 OEM steppers a few years ago. Kinda pricey, but worth it.
3.) As gnowellsct noted in post #19 which, BTW is a very good post!
Yes, you can get hardware for DSC's, it's definitely out there. I put a New old Stock set on my SP, totally worth it! (if you'd like the name, PM me.... as he is retired and may still have some in his inventory.)
As long as you don't hang a ton of weight on it, you'll be fine. I'll admit that I do have a Go-To CG-5 that I enjoy, but the simplicity of steppers with a good DSC setup works just as well, maybe if not better. Way better if I want to Keep it Simple Stupid.
My SP usually hangs out on it's stock wooden tripod, for quick sessions. But, I did like it so much that I built a pier for it, and bought another for spare parts. Oh, and if you email Brian at Vixen.... you may be able to get a newer Polar Scope reticle for it. One from a GP or whatever newer model they had a few years ago will fit. I did it to mine also. (actually my avatar picture at the moment.)
So that, my friends, is my longwinded experience with the Vixen Super Polaris. It's not the definitive on it, just sharin' some knowledge.
Polar scope reticle:
SP on the yard pier: