I've currently got the 2020 Mystic Majestic size L and 280mm stealth spreader bar size M combo. Have 2017 RE Carbon with carbon spreader and rope slider size M and a 2018/19 RE Hex core with metal spreader and rope slider double buckles per side size M.
Have ridden the 2 RE harnesses for a couple of hundred hrs each, and actually prefer the old one with the single buckle. The Mystic is a better harness when used with the stealth bars with the side wings, and has far less tendency for the spreader to move upwards.
The current model RE harnesses have no connection between the spreader and the harness body other than the belts that tighten it, and I find the belts loosen a bit and the spreader moves upwards a lot. but the body or back of the harness tends to stay put, and due to the low grip velcro, the belts blow apart when I crash on a wave.
The Mystic is just as well shaped and padded in the body/back of the harness, sides slightly wider but not bothering me, and the spreader bar is firmly held in place by the winds and dual belts per side. The Stealth spreader has 2 rope loops, the centre one I use for my leash, but can also feed the chicken loop through it for a non sliding connection. I removed the stock slider rope and replaced with a piece of 5mm dyneema with 3mm fed inside for back up and extra security and then fitted a Ronstan roller bearing pulley and ring.
www.kitepower.com.au/collections/parts-repair/products/30mm-ronstan-pulley-w-swivel-shakle-head?variant=4981422915623 The Mystic Majestic 2020 will be available early next year, the stealth bars are available now. The Stealth bar will fit and improve any harness that has elastic belts.