Hi Mike, I didn't make it very clear about the speed of the Extreme, I meant in comparison to some rather old external drives I have. The size was also a factor being so small for my mobile setup.

M1 iMac 24” 2021 - Big Sur 11.5.2

BiaB UltraPak+ 2021 Mac, (511) + pretty much everything extra.
Yamaha SLG200N - Samson Graphite 49 - Logic Pro X - 10.6.3