Although I don't have any long-term experience with it, my LGS had a VTAC a while back, and I'm not impressed with the unconventional FDE slide finish. In a strange way, it reminded me of parkerizing- it quickly becomes blotchy-looking with handling, and it seems to scar easily. As with parkerizing, the blotches and marks could be rubbed out with a rag, but as soon as the pistol touches something, a new blemish appears.
Like a parkerized finish, I think you would have two basic options- either leave it in the safe and never touch it, or just let the blemishes and blotches accumulate until they start to look uniform.
As you probably guessed, I would NOT pay extra for this finish.