Thanks Tel. He's not easy to follow but there's some handy info in there. I love the way he likes to take credit for everything
I think a new Mk2 AD600 will certainly appear soon, to fix a few obvious design flaws. I'm hoping it will reposition the flash tube a couple of cms further forward, double-up on the modelling LEDs like the AD-B2 twin head, improve the tilt lock, and maybe add a handle
BTW, the low-profile Bowens adapter he's selling, that he claims increases output of the AD600 by three-quarters of a stop I think he said (at around 5mins in), is this one - £9 from Amazon
https://www.amazon.co.uk/gp/product/B01EYJOPPS/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 My tests showed it increasing brightness by a bit less than half a stop, but that's still a very worthwhile lump of light (compared to the grey alloy mount adapter that usually comes with most softboxes).