So these don't heat up in hot weather?
Certainly not as much as a regular tent. They aren't magic - meaning if they are in the direct sunlight they will heat up. They are better insulated and retain heat and cool better. I found that they stay significantly warmer at night (when you want it and especially with a little buddy) and retain a cooler temperature for longer into the day. But, like anything, they will regulate to the ambient temperature without artificial cooling. My house does the same thing. I have a 5-gallon homemade swamp cooler that helps. But - how many of us are hanging out in our tents in the middle of the day? With two large doors and 8 windows, it cools down with moving air quickly.
We just spent 10 days in the Shiftpod in Salt Lake City and Southern Utah. We experienced thunderstorms in SLC, 95-degree heat near Zion, 38-degrees cool near Bryce, howling wind. Just about everything you could throw at me. I was generally impressed. One thing that it absolutely did well was brave 50mph wind gusts in Southern Utah. When fellow campers had a rough night in the incessant winds, we were unbothered. Other tents were collapsing - the 'pod stood strong. Lastly, it felt like we had a lot more privacy. With the windows and doors closed it was like a pleasant cave. It also goes up quickly (about 15 minutes with a tarp underneath and fully staked). Some videos show it going up in 2 minutes. I suppose it can if you just throw it up and don't install the fly (blast-shield) nor secure it with tent stakes.
In the end, was it worth the money? Maybe (honestly), especially when compared to a RTT. The Gazelle is a great product and a worthy alternative for 1/4 the price. The major downsides, other than the cost, is that it's heavy (about 70lbs) and long (just fits into my 6'bed). It not perfect for everybody, but it works for us, so far. If it lasts 10 years, it'll be the best purchase ever.
The primary reason I went with the Shiftpod over the Gazelle is for disaster preparedness. I'm not a full-on prepper, I'm a realist. I live in earthquake country. If (when) the 'big one' happens I want to be able to survive until help arrives. Winters can be cold and rainy in the Santa Cruz Mountains. In the worst case, I felt the Shiftpod is a great back up shelter (Cal-fire and other first responders use them). Anywho - there's my .02.