Not many people seem to run it when you can get practically the same thing in the MHI stage 2 for $1,000 less.
I haven’t seen a single dynograph from someone other then HKS or a person say they’re running an HKS turbo.
I did do some research and I believe HKS only made a couple of minor changes to blades inside the turbo to make it spool a little faster but also lose a little top end, compared to the MHI.