UPDATE October 2 2017
I have written a post about a dance session I conducted that uses these items. You can view that post here.
UPDATE September 10 2017
I recently posted an article on my use of all Godox units in one session. The article includes the use of this product. You can view that post here.
About the only online forum I check with regularly is on Flashhavoc.com. Why? Because the members there are civil and interested in helping one another unlike 99% of the other forums where most of them are trolls and ‘have to be right.’ One of the members, Randell John asked a question of the membership inquiring if anyone was experiencing misfires using the Flashpoint Portable Extension Head 600 versus the AD600. (Please note that throughout this review I use AD600 or H600 as a generic term. Currently Cheetahstand and Adorama are the only US retailers who carry the AD600/H600, but under their own brand names. And as of this writing Adorama is the only US retailer to carry a TTL version.) I had just completed an on location ballet shoot and could not recall having issues. So I called my son to see if he recalled any issues and the reality is the only time we used the H600 was during our last session at the ocean. I did recall that the strobe failed to fire, but only a few times. So I decided to conduct my own test to see if there is indeed a difference. I depend on excellent radio to strobe signal and plan to use the remote heads and Xplor/AD600 units for an upcoming studio dance shoot next week. So being confident in the gear is paramount.
All of the testing was done indoors at 45 feet from camera to strobe with complete line of sight from camera trigger to strobe. Camera used was a Canon 1DX Mark II. A Godox X1C trigger was used for all H/AD600 lights. A PCB CyberSync trigger and CSXCV transceiver used on the Einstein. So I could do other things like watch TV I used my intervalometer to trigger the camera. Although I had it set for 199 frames in some instances it took less than that with the lowest count being 180. Below from low to high are my results: