There's been a fair bit of discussion here recently on the relative merits of Pentax P-TTL automatic flash and manual mode or other radio triggered manual mode flash systems, especially as that relates to working with multiple off-camera flashes. Apart from the obvious differences in triggering technologies, there are workflow and control aspects that determine how we operate each system type. These issues can be about both personal preference and the suitability of each system type to each particular photographic situation.
Its no secret that I enjoy working with my two Pentax AF-540FGZ flashes off-camera in P-TTL mode, and I use automatic flash exposure mostly for this off-camera role, more so than manual mode. Just to show a little of the simple situation and setup I have been using this for, I have put together a thread over at PentaxUser (the UK based forum) with some example shots, both the results and the equipment. If you are interested in Pentax P-TTL wireless flash please take a look and I would be happy to hear any feedback and comments .....
https://www.pentaxuser.com/forum/topic/portraits-with-p-ttl-wireless-ratios-55253