The dealer here as access to both technology. If you just ask for balancing, they'll use the typical spinning balancer.
the normal balancing here costs about $50, the road force balancing costs $130. Normal balancing for me does the trick. Road Force is typically used to if there is still vibration after the spinning balancing (to confirm defective tires or imperfection in the tire itself). Also I think they recommend it for low profile tires. Minor imperfections in these tires will be greatly felt. The side wall on the 18 or 19 inch rims on an RX are big enough that the spinners will be just fine for. No need to ask for the expensive road force unless you still feel vibration after the tire balancing.

 

You have regular balancing, road force balancing and on car balancing. For the first two, wheel is removed from the vehicle, for the third - it's done on vehicle. There's special old timer machine for this.
Local to me Discount Tire does not charge extra for road force. Same price.
Normally, there is no need for those odd balancing techniques. In case you just can't get them balanced, with tire being known to be clean inside and have no manufacturer defect, on car balancing is the way.

 

Agree with ukrkoz.

Usually on the RX road force balance is not needed UNLESS you feel vibrations.

But if you have low profile tires as found in RCF, then road force balance is recommended.