I stumbled across the same ECU a couple days ago and wondered if anyone's using it. Didn't really find much using Google so I'll be curious to see what members say.
I have an ARacer RC1 ECU, the ARacer AFR module and the ARacer quickshfter installed on my RC Cup bike. I bought the bike "slightly" used (less than 200 miles on bike), and it came with the ARacer package already installed. I've got a Tyga header with the Yosh twin can exhaust, a K&N filter with the lid off.... And I'm about to add the WSS intake runner and larger fuel injector. So once that's installed, I'm gonna have Grant Matsushima dyno tune the bike to see what he gets out of it...