The HF impact is not junk. It works as well as the Rigid or any other mid-price model. The difference is price and possibly duty cycle.
Price - The Rigid unit is $310 if you don't already have Rigid tools running the X4 batteries. At that price, I will buy a true production shop level product for the $500 price tag.
Duty Cycle - If you earn your living with the tool, I can't say if the HF unit will survive the production environment or not. I know the Snap-On and Bosch units will .... at a cost of over $500.
If you have not held and used the HF unit, then you need to. HF cordless tools absolutely can be of VERY low quality and the previous model felt and looked very cheap. This new model of 1/2" impact does not feel cheap and I am extremely happy with it. I still intend to see what I can do about giving the batteries an upgrade though. I like the idea of longer run time.
If you get creative with your beam wrench, you could add a buzzer or light that could be set to specific torque numbers.
Jose