We switched over to perforce from a homegrown solution 8 years ago and have never looked back. It met our requirements: 1. UNIX (HP, Sun, Digital, AIX) and Windows support. 2. Lightweight clients 3. Fast 4. Easily administrated We currently have 70 developers plus our internal web team using it with no issues. Admin is still only one person. Scalability - we have ~ 50,000 files in hundreds of branches, no issues. Bullet proof - AFAIK, we've only lost 3 days in the last 8 years due to the perforce server being down. We are a commercial company and paying for top quality CM tools is a no-brainer compared to the cost of not having them. If you are on a much smaller team with a tight budget then SVN might be the answer. I don't personally have any experience with it so I can't comment on capabilities.