The Tourney is a great derauiller, my mom's Electra Townie came with one and it's been problem free and without need of adjustment so far. Most of my bad experiences with big box bikes haven't been with derauillers and shifters, but instead with things like the pedals, crankarms, chainwheels, seat post calmps, handlebar stem clamps and cassettes, . Many seem to be made of soft metals that will strip threads before holding things with enough force and aren't home-mechanic friendly when it comes to service. That Schwinn is defaintely one of those "jewels" and I'm glad you've had a great experience with it. There's definately no need to spend thousands on a bike if you can score a reliable one such as yours at a friendlier price.
