I have been using TortoiseSVN for the last few months and have been very pleased with it. I am using it both locally within an office and remotely via a SourceForge server. Actions that I still have to refer to a crib sheet for to perform in ClearCase are really easy and intuitive in SVN.
The only Caveat is that I am using the tool in quite a simply way. The largest team I have used it with is 5 engineers. ClearCase is designed for large projects, and I have no experience of how SVN would cope on a large scale.
The only negative is it can be quite slow when there are a large number of files in your repository. I am using the 'native file system' for the repository rather than the 'database' option, and suspect this is the cause. There were some warnings about using the database on network shares, so I kept to the native file system to be safe.
The biggest positive is the ease with which it is installed and maintained. We are not using an SVN server at all, and am not sure why you would ever want to unless you want to use a WEB browser to view the repository. We just have Tortoise client installations. Although the server package is installed on one machine this is just to get access to the backup utility (hotcopy), the server itself is not running.
Hope this is helpful.
Regards, Richard.