Until now, my SLX has held up very well and I planned to keep it for another five years. However, the crossover pipe from the head just went bad (small hole formed) and the cost of parts is too high, $3500 worse case if both pipes need to be replaced. Reason - limited supply/demand; not many SLXs were made so parts are expensive. I've never seen this pipe go bad on other cars; I recommend against buying a used SLX; spend your money on an MDX - I wish I had. I loved my SLX but it was a mistake made by Acura for which SLX owners will suffer.
I loved everything about the SLX; I had no problems countering any tendency to roll in sharp turns (consumer reports).