@Derrel those aren't cheap for sure but when you are going up against the Profoto B1 and are less than half the price of it.....
I see your point about TTL, but remember that you've been doing this a long time. For someone that isn't so knowledgeable with flash, I think it can help them get in the ball park a lot faster than trial and error.
I knew that I'd convert you to HSS...
YES, the Xplor600 is right at about one-third of the price of a comparable Profoto B1 Air monolight: I saw the video you linked me to some months ago, and the Xplor600 actually out-performed the B1 Air in many of the test criteria! Not too surprising, since the Profoto B1 Air was, as I recall, the very FIRST TTL-capable battery-operated monolight when it hit the market, and the designers of the Xplor600 had a complete list of what they needed to match or to exceed in order to make a very viable competing product in that category.
My cost concerns are not so much versus the B1 Air, but against low-tech monolights that are $99 to $159 each; while not giving High Speed Sync capability, low-tech 150 Watt-second monolights, or even low-cost Made in China HSS-capable speedlights ganged into 3-unit or 4-unit groups could give a close approximation of the power of a single, $729 monolight, for a price of something like $190-$300, not $729.
Still: I want to say that I think that TTL flash control is wayyyyy LESS-valuable than is HSS, and there are monolights that can do HSS, but which are NOT TTL-compatible, at considerable cost savings. A lot of outdoor family/senior/wedding stuff is going to be shot at the same, exact f/stop at fairly common distance ranges, and manual control of the flash power will work quite well, but the ability to go to High Speed Synchronization mode, and the capability shoot at high shutter speeds and wide f/stops--now that is valuable--much, much, muuuuuch more-valuable than TTL flash squelching.