Yes it is. And as I said, when something *really* matters, they do it
well, regardless of whether you are an A340 or a Cherokee. But there is
a reason a Class B airport is a Class B airport. And while,
theoretically, a 152 on an IFR training flight is no 'different' from a
767 with a full load of passengers, the realities *are* different.

The guys at CVG don't want a 172 mixing with their big iron. And I
can't blame them. Their job is to help ensure the safe and efficient
operations in and out of their airport, and 75 knots just doesn't mix
well with 180 knots. They know there are 3 perfectly good GA airports
within 25 miles. If you are GA, it seems that they want you to use
them. They also know that that 777 costs $15,000 an hour to operate,
and making him miss because he can't slow down enough and the 172 ahead
of him can't speed up enough is going to cause all kinds of headaches.

It's like most other things in aviation operations. If an approach
controller is pretty certain you know your stuff (i.e. you're a freight
dog, and he recognizes your tail number or call sign) he may well give
you a different approach (i.e. slam you in right at the marker, between
traffic) than if he thinks you are a 'random' or inexperienced GA IFR
pilot (i.e. stick you in a hold until everything is clear, then give
easy vectors out to the boonies to get you established). And can you
blame him?

I'm not saying the OP *can't* go into CVG. Obviously he can, and he
seems to have a very good reason for choosing CVG over Lunken. But I am
saying is that these guys have a job to do, and random GA planes flying
PLAs into their airport can make their jobs harder. They don't like it,
and they make that known.

Cheers,

Cap