MCI? Convenient? Maybe for arriving flights. If you have a connection or a departure, it's bloody terrible. I've never been in a more poorly-laid-out airport. Instead of one checkpoint per concourse like any sensible airport, that rathole set up a jobs program for their security types or something, and set up separate checkpoints for every half-dozen gates or so, with each post-security area closed off from all the others.
Changing planes? Guess what... chances are you have to leave the secure area and go through the TSA goon squad again to get to your new gate. Departures are just as miserable. The post-security amenities in any given slice of the secure areas are paltry and low-quality at best. And that's if your flight is departing from a gate that HAS shops or restaurants in its little chink of the secure area. I've never had the displeasure, but I've been told that there are a couple that don't even have post-security bathrooms.
It's also *really* far away from almost everything. If you're downtown, it's not that bad. But if you're there for business or a conference, it's a good hour's drive from the the Overland Park district where you'll be.
Don't get me wrong. I'm not hating on KC. The people are nice and I've had a good time every time I went. But the airport is a disgrace.