I will add my 2c to this discussion.
After many years of just using a small back packing ground tent(Currently a Big Agnes Copper Spur HV) I got a Tepui Ayer Explorer last November. 92% of the time I travel totally alone, I try to go quick, light and minimalist as possible.
A few reasons I came up with to try and support my purchase,
- Ease of finding a campsite, like finding pullouts on back country roads or trails,
- Not having to find an as level site needed for a ground tent,
- Not having to worry about what the ground cover is(clearing rocks and sticks that might damage the floor of the ground tent)
- Setup time, including keeping bedding in the tent
- Comfort, as I would always just use my Thermarest Neoair xlite mat which is ultralight mat for backpacking, which I could sleep very well on and I didn't want to waste money on a second mat just for car camping
- Bit more protection from the weather
I have used my Tepui for a total night of around 50-60 in most conditions. There are things I like about it and a few I don't, a few of them come down to quality control from Tepui.
Pros I have found of the RTT,
- Warmth is winter. I was actually quite surprised at how much warmer it was
- Setup time for me is quite quick but leaving my sleeping bag and gear inside the tent while closed
- Heaps more room than my ground tent
- Great view from the roof
- I feel a safer on the roof so I sleep better
- Leveling the car is easier than finding a flat bit of ground for the ground tent
- Easier to sit up and read in a RTT
- Easier to install and remove from the roof racks than I thought(using Front Runner RTT mounts on a FR Slimline Rack)
- Makes my friends jealous when we camp together and they are in ground tents(probably the most important!)
Cons,
- I have to take it off when I'm home as I only have 1 car and having the tent on there permanently hugely restricts where you can go(carparks ect)
- Having to get up and down the ladder to relieve myself in the middle of night
- The time the fabric takes to dry compared to my ground tent
- You extremely need condensation mat if you are in the PNW in November and December like I was.
Problems I have had with the Tepui Ayer,
- Tepui's seam sealing/waterproofing is an absolute joke, I had heaps of leaks and fabric soaked up water quicker than a sponge, soaking the mattress and my sleeping bag. I have now re-seam sealed and re-water proofed the tent but it's summer in Socal so it won't rain for another 3 months to test it
- Tons metal shavings under the mattress I had to clean out
- The normal mattress for is WAY more UNcomfortable than even my ultralight hiking mat. I am 5'10" and 170lbs wet and it feels like I am sleeping on concrete. None of the off the shelf mattress(Exped, Nemo ect) fit the Ayer nicely so I am going to have to go custom. I was told by Tepui that the lux mattress is even firmer than the standard one.
- I had to drill out 2 of the holes for the poles that hold out the rain fly/windows as the poles would not go in straight from the factory
All in all I like it more than the ground tent. Once I sort the mattress out and confirm my water proofing efforts are good it will be even better.