Thx for the answer. Sounds very nice. I decided to go for the MysteryRanch NICE frame two years ago. Kifaru was the alternative option (I liked the design of the NICE Load Sling better than the Kifaru version). Very satisfied with the Mysteryranch waistbelt. Quite thick (more padded than the stiff Gregory ones). And - the best - kind of modular parts. Two pieces of the waistbelt (located on top of your kidneys) can move inwards, and are connected with the rest of the waistbelt via a 'wing'. So if you tighten your waistbelt, the kidney-pieces are pressed inwards, and: no more holes or sliding down on your back. It really works well, even with heavy loads.The Omni belt, even with the padding is quite soft and thin. It works, though, because of where the weight is supported and it seems to mould to the hips rather than sit rigidly on top.
Till I am ready for a McHale pack in 20 years, The NICE should make it. Good quality. But Kifaru remains interesting. The models around 60l would make a good grab'n'go-pack.