If you want to switch to Subversion and want to get support, I recommend that you go with the Subversion provider. I work for ProjectLocker , but if you use Google "subversion hosting", several options appear.
The Subversion code base is incredibly stable, and we never had a problem with the basic functionality not working as advertised. We have some patented fixes for the parts of the product that we wrote, but this is a solution to our unique scaling needs, and not due to product flaws. In our experience, any single large installation will be more than adequately served by standard code, even if you have hundreds of developers on your team.
Your support needs are likely to be related to using the product or administering the product. For both, The Subversion Book is an excellent guide that explains in detail how to use the product. Most Subversion hosting providers also have technical support that can answer usage questions, as well as web interfaces that facilitate product administration. Finally, posting a specific Subversion error message to Google goes a long way; people have been using this product in the wild for almost 10 years and have seen everything they can see.
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