Yes! It's that good. We fly from Europe to the US for four years now. Been to Colorado, California, Wyoming and several times to Utah. As for Powder it is definitely Utah. Also there are a lot of resorts in the SLC area. We always stay in Park City. Staying at Ata/Snowbird is way more expensive. Park City is a nice place to stay. But be aware that on real powder days the road to Alta/Snowbird can be closed for quite a while. Sometimes 4wd's are obliged.
You will read a lot of favourites but over all you can not go wrong. Every resort has it pro and cons. Much depends on snow and weather at that time. To give an short impression:
Alta: Most snow of all areas. 13-15meter anual. That's why avalanche research started there.
Snowbird: next to Alta. Lots of snow. Steepest terrain.
Solitude: Go to Honeycomb canyon and enjoy this massive paradise.
Brighton: lots of boarders and kids while we where there.
Park City: Go to the backbowls (Mc Conckey / Jupiter) for steepness and powder. Big area with everything to offer. Ski right into town. Great choice for a day you do not want to travel far (if staying in PC).
Deer Valley: Best corduroy ever seen anywhere. And also a little secret for powder after it's skied out at the other resorts.
The Canyons: Largest Utah resort. Enjoy the Orange bubble (lift). Lots of terrain here too but a bit more difficult to explore. Try to hook up with a local.
Powder Moutain: also lots of powder to be found after it is skied out at other resorts
Snowbasin; check out the restrooms here :-)
Fingers crossed you will have the snorkel deep pow we had there!!!
Edited by dirksuchy - 7/17/11 at 1:01pm