Frankly, the best seats I have sat in outside of a couple BMW Ms. Supportive, well bolstered with good lateral support. Also good support for the lower back for long drives.
There are few cars more reliable than a Civic. My experience has been justified - the only things I have replaced after nearly 40k miles have been wear parts.
Overall total cost of ownership was far less than other sporty models, to the tune of over $1200/year, before even considering the lower price and less depreciation.
For its level of performance, the Si produces very good mileage. Even when absolutely flogging the car, I still get 23-25mpg, and under normal circumstances, I see 26-32