I have a couple 1.93 Scalarworks mounts and really like them. Very light, seem to be durable, and the QD system is awesome. The Arisaka will obviously save money and really only doesn't have the QD from a comparison standpoint. If QD isn't necessary and you need something now but don't want to spend Scalarworks money, get the Arisaka. If you can be patient, watch the EE here. I've picked both of my 1.93 mounts on the EE for around $100 shipped.
ETA: Dang, the Arisaka is double the weight...that's insane! We're talking 1.5oz here, so not a ton, but significant when you consider what it is.