I have the REI Kingdom 4 tent for me and my family. As an UL backpacker, I have grown quite accustomed to buying a particular item for a particular need, so I didn't mind buying a larger tent that is only for car camping. And TBH, in retrospect, I wish I had went with the 6 person version…
The 4 person is large enough for us all to move around freely and not feel cramped or smushed together, but what gets me is that I can really only fit 4 20 inch pads on the floor; I can squeeze in a 25 inch pad in with 3 of the 20 inch pads, but we would be pretty close to one another. Not that this matters, we are all family…
For 2, just me & my wife, the tent is awesome! We love all the space.
But the 6 person would have allowed me to use 2 of the full size Coleman, big blow up mats inside, which is nice for us. Also, it would have been a few inches taller, and while I can stand in the 4 person tent with just a little head tilt, the 6 person is more than tall enough.
Set-up is easy enough for 1 person, although 2 does make it easier. However, I have always set mine up on my own. It isn't really all that difficult. It does have the little sleeves that the pole goes through, and I think that makes is a but easier as it guides the poles to where they should go.
We haven't used it in tons of rain or wind, so I cannot say much on that aspect. All I can say is that they few rains it has been in, I did not see any leaks. I feel like if the wind really picked up, it likely wouldn't perform very well with the tall, flat walls. In the reviews I have read others mention the same thing.
Anyway, I got mine on a pretty steep sale at REI, and while their return policy has changed, if anything ever still happens to the tent, I feel confident that they will still warrant it. However, if anything ever does happen to it, I will likely upgrade to the 6 person…