Recently purchased the SkyFi III device and was happy to see Sky Safari 6 was supported by my elderly Samsung Tab 8. I have encountered NO issues whatsoever at this point.
The SkyFi is a piece of pie to set up and has brought new interest to using my Meade ETX125 (original version). I was a little skeptical of the wireless device, but I have to say it has met ALL my expectations and THEN some. Eliminating the cord tangle at the telescope and tethering the ETX handset to a PC of some sort is well worth the cost.
I have had a copy of Sky Safari dating back to the Southern Stars time period. I recently upgraded the software on my Samsung S7 phone (version 6) and then proceeded to take the plunge and purchase the interface.