Depends on the era you're in. We liked training on the real aircraft. Surely, the issue of a real V1 cut is how much concrete you have available? And I suppose an acute awareness of real mechanical issues.
And yes, many's the time I've been whisked into the air again without backtracking.
The man from the manufactures used to turn up - never a sign of a co-pilot - and the flying was just plain bewildering. Our to-be cheif training captain asked if the fire handles could be re-set in flight, and yer man just pulled one, re-set it, and pulled it again . . . several times. I looked in dismay at the engine temperatures and wondered what the long term effect on the blades might be. I was waaaaaaaay to junior to make comment.
All stalls were done to the push, and with the mental imagery of Mike Lithgow's flight still clear in our minds.
Simulators are very useful tools, but when I moved to the left, I would hate to have found myself there with nothing but simulation to found my abilities on.