This mower looks great, rides well, but quality wise it feels cheaply made. I traded for it in used condition, which may reflect most of my issues with it's reliability.
However, I have a model 2166 that I purchased new in 2000, that has not let me down to date! I feel that quality wise, it is at least three times the mower that the 2554 is, with over 450 hours on it!
The cut on the 2554 is poor, and from the reviews/issues on forums, there seems to be issues quite often over the deck/belts/blades. The steering is another issue, it is extremely hard to steer in comparison to the 2166.