Instead we used iPhoto 9.2 (an updated version from the 2011 iLife suite). For iPhoto, going back to 10.6.8 means iPhoto 9.5 (2013) or iPhoto 9.6 (2014) cannot be used either.
The results were mixed, but mostly positive. This article provides a detailed look at a recent attempt to revert from 10.10.3 to 10.6.8, without the benefit of a Snow Leopard Time Machine backup. Reverting to an earlier version like 10.7 or 10.6 can be more complicated, especially without a Time Machine backup. As an example, if you are reverting from 10.10 to 10.9 (the next most popular version of OS X) and you have a Time Machine backup, the process is relatively simple.
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How easy or difficult the reversion is depends heavily on whether you have a full Time Machine backup of the original system installation. The reasons for doing this will vary but the two most common are application incompatibilities and/or a dislike for the changes made to the user interface.
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One of the more interesting requests we get from OWC customers is how to revert from OS X 10.10 Yosemite to an earlier version of the system.