The 1999 Monte Carlo Z34 was my very first car, and I've had it for over 3 years. Naturally, as a teenager, I've put it through a lot. The leather option is nice, but is somewhat "cheap" feeling, not at all like the leather found on newer models. Gas mileage I would have to say is "average." As a high-end V6, it definitely has power. Handling is good, steering seems good to me. The AC and heat is "average."
Leather interior, sporty feel, plenty of room for a carload (especially for a coupe!) good handling, ample power.
The plastic parts of the interior are made out of really cheap material. My console has all but fallen apart. It's peeling, the ashtray lid is broken, and the console lid is broken. Another cup holder would be nice, as the '99 only has one. I've found the alternator to be a problem, with this style.