If you don't mind DTs of a fixed width, then IMO it's a great deal. I used to own the VS600. It works well and is easy to use.
There was an "upgrade" in the later years of the VS600, an attachment that improved dust collection. If the model for sale does not have it, check if Festool might still stock the part. If not, ask yourself whether it would matter to you that dust would be all over the place. Maybe that's not important, to each his own.