I use my IP slow cooker function often. The trick is in the prep.
Whether it's a roast, a pot of chili, or chicken and dumplings the trick is to use the pot to prep the ingredients before switching to the slow cook function. I love this because it means I don't have to dirty a separate pan to sear the roast, brown the hamburger, or bake the chicken like I do when using my crockpot. In fact, chicken pressure cooked is much easier to shred.
For example, when I make chili, I use the Sauté function to brown the meat. I drain the grease from the meat in a colander. Meanwhile, I Sauté the onions, garlic, etc and deglaze the pot. Then I add all my other ingredients and set it on Slow Cook on high. Be sure you stir occasionally. Works like a charm.
I've read tons of complaints on this page about the Slow Cook function not heating food well or taking forever compared to a crockpot. I decided to test it one day using my method. I checked the temperature with a digital kitchen thermometer periodically. At 4 hours, my chili was 202⁰F. Plenty hot.