I tried Slide about a year ago now for lunch. I ordered 2 sliders with a Groupon, and they came with chips and a drink. I took them home to eat, and I'm really glad I did because I cut into them to find that they were raw! I'm totally fine with medium cooked burgers, but these were cold and bright red in the center. I ended up having to microwave them to cook them through and eat them. The chips were good and the sliders were otherwise fine.
Based on other reviews it sounds like my experience was uncharacteristic of Slide, but I was really not pleased. While I'm glad others have not had this issue, I unfortunately don't think I am brave enough to try Slide again.