Sorry to hear this, I was in exactly the same position in 2011/12. Fitted a VNT on the basis that there would be a controller for me to buy from the same guy you've been dealing with. Never materialised so built an arduino controller myself as got tired of waiting (this is another option for you!!).
There is another guy running one of these elusive controllers but yet to see any dyno figures from it (unless they've been published and I've just missed them).
There's a post above from Jan 2016 saying the controller is virtually finished... I'd be peeved too! Hope he delivers the goods for you and you can press on.
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ZS Turbo!!*cough* (diesel)
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