Stayed for 3 nights in March 2015. Overall, a positive experience and would likely stay again if we chose to ski Alta. But the prices are about the same as options for Deer Valley, so might choose that in a year when Deer Valley has better snow.
Stayed for one night in a newly-renovated Alpenglow room. Moved because of a very noisy heater. Stayed two nights in superior corner; worth the money (as long as not on the bottom floor because people would walk right by your windows). Much more light and room, and although not as recently renovated, perfectly acceptable if a little dated décor.
Ask the desk for help on choosing a room - and note the hotel is built into a hillside, so what is ground level on one side is not on the other....
What we liked:
1. Location - ski down to rope tow to get to Alta lifts. Take Rustler chair back up at end of day. Could not be easier.
2. On-site ski rental shop - prices maybe a little higher but oh so convenient and good ski options
3. Spa - had a couple really good massages; but had to call multiple times to actually reach someone and book - they don't return voicemails
4. Food - good vegetarian and gluten free options; appreciate that because meals are included in the price, you can get room service at no additional charge (and it was quick)
5. Proximity to SLC airport (about 45 minutes)
6. The skiing at Alta - no snowboards, which is good by us. Snowbird does allow snowboards and you can get there by shuttle or from the top of Alta
7. Lift passes available at hotel
What we would suggest be improved:
1. Staff was adequate but nothing special (based on reviews, I expected more personality). More than once while eating in restaurant, heard staff sniping at each other.
2. It's expensive - I think our rate was close to $900 a night including food. I realize it's high season and there aren't many options in Alta. But for that, I'd expect glasses in rooms (not plastic cups in plastic) and ideally coffee makers. Coffee is available in the hall, and I realize individual makers might be pains - but they are pretty standard at hotels at lower price points.
3. Follow through could be better - they nicely took orders for meals because we were arriving late one night and would miss dinner. After specifying vegetarian and gluten free (needed for medical reasons), we got a chicken salad with croutons....
In the end, if we go back to Alta, I think we'd stay there. I peeked in the Alta Lodge and didn't think it was comparable.