I ran this setup for many, many years. It's infinitely better than just the pedals on the floor.
I have done some practice with the SRF in iRacing but I decided to run my first race with it last night. Let's just say I need more practice. :/ The sudden oversteer is something else! That or Watkins Glen was incredibly slick last night.
The car is unusual to drive because of it's rearward weight distribution, paired with good mechanical grip. It definitely takes some getting used to.
It's a great car to learn in because it forces you to be very disciplined with your braking points, and entry speeds. These are generally things that won't cause you to outright crash in most other cars, however they don't teach much about them either. Late on the brakes here, a few mile an hour extra entry there, and you'll have a slow corner in a converted road car. Chances are you won't even bother to look back at it critically. If you do those things in an SRF, you can be going backwards in a hurry. You really have to stay disciplined.
It is a momentum car though, so even though I just said you can't take more, you also can't take less if you want to be quick. You really build a relationship with the car as you find all those nuggets of speed just underneath it's set-in-stone limits.
Tips:
Brake early and straight. Creep it up a little at a time to find the limit. Never go deeper than you've been before in the heat of battle. Stay disciplined to your braking points.
You want to get back to the throttle as early as possible because that's what's you use to stabilize the car. You can shift the weight backwards (on throttle) to get the weight off the nose, and stabilize a sliding rear end, or shift it forwards (off throttle) to get the car to rotate and turn-in.
Do a practice lap(s) of driving off-line in brake zones at every new track. You're going to be spending time there. What the car does with a shallower entry line surprises lots of people. The extra lock need to make the corner amplifies it's nature for the back to overtake the front.
Be smooth and conservative and prey on those who aren't.