I must say I have seen 400 Nitro and Rusty shoot and reload. They are plenty quick.

However most of the time when they shoot, they do not need to reload.

I will say again,on a stopwatch, I can reload an ejector gun a little faster than an extractor gun.
However most of the time they are a slight pain the ass, as most of the time you are not in THAT big of a hurry to reload.