We at one time listed 50' max. However, that would be under ultimately ideal circumstances, i.e. a flash aimed right at a slave sensor in a dark room. Also, there could be a build up of dirt on the slave eye over time, so older units may be less sensitive than they were when new.
If you rely on bounced light, low power flashes, lights that are shielded behind softboxes, etc, the distances will be dramatically reduced.
There is no issues with combining types of lights (even other brands) and slaving optically.
If range and reliable triggering are a concern, I would suggest using a radio remote system, like CyberSyncs:
http://www.paulcbuff.com/cybersync.php
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