I now have Zee cranks on my Soul – I was offended by the price I’d be paying for an unused BB and chain rings with other Shimano choices so thought I’d give them a go. From what I can see they’re basically Deore arms with a stiffer stronger axle and 1x only. They are far stiffer than the Truvativ Stylo I had before (originally off my Boardman HT Pro 2010), to a shocking degree. I didn’t expect to notice any difference, especially on a relatively skinny steel frame, but it was blindingly obvious just sprinting up and down my road, and again on the trails last night (again, on the sprinty bits).
I don’t know how heavy they are but my gnarlified Soul is now up to 26.8lbs, from 26.5lbs, and since then it’s also gained a steel 10mm thru-axle, a UST rear tyre and the transmission’s gone Saint/Zee with Works XXI-style 34t and XT cassette from X9 with Hope 32t and SLX cassette.