15mm vs QR – Taper vs straight – Both of these upgrades happened simulateneously so impossible for me to say which had more, if any effect but the combination was noticeable.
The spring of steel – Yep, moved from an ally rockhopper to a Soul and yeah its definetly there! Was the most noticeable difference other than the geometry.
The comfort of Ti – Never tried…
Pick up – what? Oh hell yes, massive difference between the pickup on my bonty race wheels and my pro 2’s the bontys feel like they take a good 20% roatation to engage whereas the hopes feel more like 5%. Very, very noticable for me.
Crank stiffness – only ever had HTII BB’s so wouldnt know.