Mower,
I can only say this. If your CPU/GPU are within specs for a Rift S, indeed it'll be a flight sim changing event. There's no way a Rift S can match the resolution of a pancake/monitor display. But the immersion is more than worth it.
I remember reading a post from dburne, about how during his first flight, he nearly wept because of the immersion factor. I can honestly say I felt the same way. I started out with the Rift CV1, and my first flight was with the 109. Just looking in the cockpit, like a real aircraft was incredible!!!
There is no way, absolutely NO WAY I'll ever go back to pancake mode. Regardless of resolution. The key thing is whether your HW can handle the minimal specs. If it does, take the VR pill by all means!!!
best wishes bro!
-Jav