It's our everyday seat for my 6-year-old and has been for...gosh, at least a year, probably longer. I love it extensively. She's about to graduate to a booster in that car and I'm really sad about it because I love that seat so much. (But my almost-4-year-old can use it soon.)
I have had no problems at all. The weird seatbelt routing hasn't been an issue. I can install it in 30 seconds. It still tightens and loosens like butter. My daughter has never once complained about it, and we take a lot of very long trips in the car. We've driven from Chicago to Florida and back, Chicago to California and back, and have made numerous 3-5 hour trips in addition to our regular everyday stuff. She's not much of a car sleeper, but when she does sleep, she props her head on the wings--no slump for us.
Obviously people's experiences will vary, but ours have been all positive.