Humm, I've got a bunch of Kimber 1911's of various flavors, but longed for a SCU+ myself. But being discontinued, only used ones come up now and then....and in varying degrees of condition.
That said, when I finally found the SCU+ for under a grand, I jumped on it. After stripping her down I learned that it had indeed been shot, and shot quite a bit. The night sights were dim, springs questionable, and it had a few dings in the slide finish, being 9 years old.
So......off to the Mothership she went, RMA in hand for a complete rebuild including new night sights, all new springs, slide refinish, function test. When it comes back, it'll be as new.
BUT, by the time I'm done with this project, I'll have that $1,200 gun I wish I had purchased when they were available. I'm telling this so you can consider the used gun may need some TLC. The last SCU+ was made in 2011, so more $ may be needed to bring her up to snuff. Consider too that they will only get harder to find in good shape.
Oh, and the price is right on that Aegis Ultra 9mm too. What to do, what to do?
(Full Disclosure: I have an Aegis Elite Custom in 9mm and an Ultra CDP 9mm. Love 'em both too. But SCU+'s only come up now and then. You "need" both.