I don't give five stars.
This thing is a tank!! Love it, I mow approx 2 acres at home with a another that is soon to be seeded, so I'm not mowing it all the time right now. I also mow a couple lawns in town. I don't think there is anything better than fresh sharpened blades and a cleaned out deck and your are mowing at fill tilt and just loving it. I have never had a mechanical issue with it at all. Other than PM i haven't touched it to be honest.
Though it does seem a little underpowered at times when you are cutting 3"+ of thick grass it doesn't throw the grass as far you would like. But you have to remember that you are also cutting 3"+ at ten mph! (I mean cutting 3" off the top, not cutting the grass at three inches.)
I need a bigger mower for my own yard because of the time it takes, I'll be buying a bigger Scag for sure!
The only bad thing I can say about it is when you are mowing down STEEP hills it will loose traction easliy. On a ZTR when you lose traction you also loose the abilty to steer. But the grades I'm talking about ia probably 35%. I haven't driven many others especially down STEEP hills but I would amagine that they would do the same thing.