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Its all in the operator unfortunately, even if they have the best kit in the world, if the operator is poor the results will be poor.
Never heard of Blacktech though.
A proper hunter optical machine should be fine, but a lot of operators don't setup the rear carefully (which has to be done first as it effects the front).
On a RWD car the rear alignment gives the thrust angle (the angle that the car is 'pushed' at) which then offsets the required front geometry.
Its best if they spend the time to get the rear set spot on so the thrust angle is zero degrees, the the fronts can be set spot on too.
If the rear is out, the front will need to be set offset to compensate, and if they don't clamp the steering wheel properly then it will be out too.
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