You can't go wrong with an APR tune. Viezu is the only other one that I know of that doesn't have problems but then again, I don't know of anyone running the GIAC tune so I don't know how there are any 'issues' especially as you have probably gone and spoken to an APR dealer, no?
REVO have problems, I'll put it that simply. Nearly everyone I have spoken to that has had a REVO tune has gone elsewhere. Contrary to what REVO say, it seems that their programming actually harms the engine rather than making it safer.
i have Viezu and couldn't be happier. The torque delivery is killer and fuel economy dropped by 1L/100kms over the average cycles. Others on here (fastlane especially) can attest to what my car is like
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