I've only used it a few times, but was very pleased with the results.  I've tried it on pork roasts and beef stew, and the meat was exceptionally tender.  Food does have more of a stewed flavor and I could tell the difference between the pressure method and slow roasting in the oven, but my husband and son preferred the pressure cooked meats.  The only down side is that I'm afraid to leave the kitchen while I'm using the pressure cooker.