I just came back from a Tempe Leadership retreat at Saguaro Lake Ranch. It's a beautiful spot! I'd call the cabins "modern rustic". There are definitely upgrades, such as A/C units and newer tile flooring but also original or close to original structures, decorated with southwest themed furniture and artwork. Some of the art is just breathtaking!
The staff were very nice and the food was really good. You can't beat the fresh blueberry pancakes with giant, juicy blueberries. Yumm! The staff were very accommodating to our group.
Tubing in the Salt River was one of the best features of the retreat. It was a little brisk in the morning, but it was a refreshing and wonderful way to start the day. They also have a swimming pool on site.
The location is only 25 miles from the Phoenix metro area, so it was nice to get away but not have to be stuck in the car for hours.
Cell phone reception wasn't too bad, although I had to go outside to send texts (I have T-Mobile). I don't know about the wifi situation or the pricing for group/ corporate reservations. The non-group rates are expensive, but I think you get a lot for what you pay for, especially considering the hospitality, cleanliness and high quality of food.