It's just fine with 4 people and really what this tent was designed for. My son is 11 and daughter is 8 and we're pretty comfortable in there with all of our bedding and basic stuff (change of clothes, dirty clothes bag, etc). We store shoes in the hanging bags or sometimes tuck them into the vestibule bar.
If you have 4 adults then you had better be good friends but 2 adults and 2 kids it's just right.
We've been considering selling this tent lately or at least moving it to our military trailer. I would really like something enclosed and a bit more streamlined like an AT Overland Summit. Still waiting to see if they make a long bed version tho.