We use Subversion and TortoiseSVN here aswell, in a web development environment, and they do work very well. Certainly far better than I remember SourceSafe working, but I used SS back in 2003. Tortoise can improve, of course. Now and again a commit or an update will merge your files in a flawed way, and there are occasional folder problems. These problems are usually fixable within a few minutes, and have never threatened a project.