I've been in to this PDQ -- err, Kwik Trip? -- probably a million times. I used to work near by and this was very convenient for me.
The staff was almost always on their game, friendly and helpful, never seemed annoyed with customers or anything like that.
There have been a handful of times when there had been some shady characters loitering outside, which can make for an uncomfortable visit, but it was pretty minimal. A lot of the people who frequent this PDQ/KT didn't take the time to park properly, either, and with a small lot that can cause issues.
Other than that, no real complaints. It's always kept pretty clean, too. Even the restrooms!