Optional bucket seats are more comfortable and adjust every which way. We like both the premium cloth and the leather. The bucket seats are separated by a deep center console that holds lots of stuff. The top of the lid features a nice rubber-lined indention handy for small items, though it would be even better if the rubber was an insert that could be removed for cleaning. The top of the console is angled forward, which seems unfortunate because clipboards and other items placed there tend to slide off. A big coat hook makes picking up the dry cleaning easier.

The instrument panel features a large speedometer and tachometer. Smaller gauges to the right display oil pressure, water temperature, fuel quantity, and battery charge. HD models with the Heavy-Duty Trailering Package come with a transmission temperature gauge on the left. All use highly legible white-on-black graphics. Headlamps and taillamps turn on automatically when it gets dark. A Driver Information Center, located in the instrument panel cluster, provides various bits of information, including an available engine-hour meter.

Dual-zone climate controls are standard. The manually controlled system that comes on base models is a good, straightforward design. Manual sliders are used to adjust the temperature The available electronic climate controls are better, featuring two large knobs for driver and passenger. A large LED displays the mode and fan settings. It's a well-engineered system that's sophisticated yet easy to operate.

The stereo systems feature digital controls with large knobs for volume and tuning. It's a good setup, more attractive and more sophisticated than some earlier systems, but just as easy to use. XM Satellite Radio is a great addition for people who want minimal blab interrupting their music, or who like to listen to 24-hour news or sports channels like NPR, CNN or ESPN. Satellite radio also means you can drive across the U.S. without ever having to switch from your favorite stations.

The 2006 models are available with a new generation of OnStar (called Gen 6) designed for improved hands-free operation, thanks to more intuitive dialing and improved voice recognition. OnStar is the leading provider of in-vehicle safety, security and information services in the United States and Canada. Using the GPS satellite network and wireless technology, OnStar features core safety services and OnStar Personal Calling that allows drivers to make and receive hands-free, voice-activated phone calls.

The back seat in Extended Cab models offers more room and comfort than expected. We wouldn't want to ride across the state back there, but three adults can fit and be reasonably comfortable for a short trip. The rear-seat bottom folds up to provide space for cargo, but it's still in the way when trying to carry a lot of stuff, and the floor is not flat. The entire rear seat assembly can be removed with a wrench and lifted out through the door when cargo capacity is more important than passenger space.

Crew Cabs offer roomy rear seats and additional interior cargo space. The back seats in Crew Cab models are very comfortable, similar to the rear seats in a Suburban or Tahoe. The rear seats can be flipped down, like those in a Suburban, to provide a big, secure cargo area.