How do you mean?
It's a tight fit - not a lot of room to wave your arms and legs about, but you get tailor the steering wheel and pedal positions to how you like them, and you make a custom seat that fits me 'exactly' (subject to change from eating too many pizzas before a race). I can't do my own belts up, and we tighten them to the point where it starts to hurt - which is very easy if I don't arrange myself [cough] before I get in. Once out on track the vibrations and g-forces settle you down in the car so the belts go from painful to being bloody tight but comfortable.
In terms of feel, it's like you are part of the car. You still move around with the g-forces a bit because a human body is a flexible squashy thing, but to all intents and purposes you are a part of the car. The instant the car does something you feel it. Whether or not you react quickly enough depends on your talent (or lack of - see Video 1 above!!).
It's a nice place to be. Arguably more comfortable than many road cars (tailored seat and reclined seating position).
The steering isn't that heavy - even accelerating through the corners you can drive one handed if you have to, and you try not to grip the wheel too hard because then you don't let the car move. The aim should be to let the car do as much of the work as possible...
The throttle is sensitive, but I use quite a long travel to aid sensitivity. This helps in the wet I'm sure! The brake pedal is like a rock in comparison to a road car. When we've bled it up you can't see it move, other than the initial freeplay in the mechanism. The clutch is about as heavy as a road car brake, so you have to heave on it a bit, but I only use it at the start - upshifts and downshifts are entirely clutchless, so the pedal just acts as a footrest most of the time.
Visibility is good - my car doesn't have modern high cockpit sides - even with a HANS device. The mirrors are convex, so I can see a lot behind me and to the sides. With a bit of a stretch I can just see my front wing endplates.
If that's what you meant, then great. If you meant something else, then I'll try again.
One day I want to get a decent driver in the car to see how it should be done, but until I can afford that I'll have to make do with me.