they arent cheaper....the listed items are one piece of many to make it workable.
for example the arri wcu-3 to make it workable you need a whole bundle
from abelcine for iris and focus only
http://www.abelcine.com/store/Arri-2...ontrol-System/
PACKAGE INCLUDES
(1) AR-312810 – Arri WCU-3 Wireless Compact Unit
(1) AR-312808 – Arri UMC-3A Universal Motor Controller
(2) AR-312800 – Arri CLM-3 Controlled Lens Motor
(2) AR-312804 – Arri Clamp Console for 15mm/19mm
(2) AR-312806 – Arri Gear Z=60 / 0.8
(2) AR-312802– Arri Cable for CLM-3
(1) AR-312812– Arri Cable for UMC-3 to RED P-Tap
thats around 23 000 dollar.
add a case, backup cables, and batteries and you end up with 24 000 dollars.
it brings around 250 dollars a day when renting it out.
we will go arri wcu -3a, although the cmotion is better in my humble opinion. since we shoot ourself, but refinance equipment through rentals too, we go for Arri...makes more money on the rental market. that simple for us.