You will know best what your individual needs are. I have stayed multiple nights in a GFC and a couple others i don't remember the brand, but they were bigger with ladders coming off the side like platform. I have never owned one, and don't anticipate ever needing to. I spend a lot of nights in a rig however, hunting and just camping. Overall I would say i would advise to shy away if looking to use it for hunting, but certainly don't share meeps level of disdain
IMO the pros: They are cool, kids love it. They impact the mobility of your rig very little. Setup is quicker and more efficient than a full ground setup of similar size. They free up some area in the bed of the rig. Safer in grizz country. They seemed very weather proof. ( heavy rain, and some wind, no snow experience)
Cons: You need a good option for drying. A shop you can pull into that is heated and put a fan on it is ideal. And will keep it working well for years. They dry pretty quick, but will also mildew pretty quick if not dried out after use. If you don't have a good plan for this, then I would pass no matter what, as you will be destroying a significant investment rapidly.
If your using your rig to travel back and forth from camp to hunting area, its a PITA. Too much hassle for me under the best conditions and will only increase the later into season you get IME.
Expensive for what it is and add-ons, add-on.
During early season I need high mobility. I rarely have a "basecamp" but will spend many nights in my rigs. Both my tundra and 4runner are setup so I can sleep very comfortably, and be on the road in the time it takes for the rig to warm up, that includes brushing my teeth and a cup of coffee. the roof top just ends up cutting into that time by being another thing to stow. Late seasons I like a nice base camp, and am usually driving a good bit between hunting areas to and from. Being able to have a "home" for the long nights is a game changer. Again the cramped quarters and no heat are not ideal in this situation.
A rooftop is not well suited for MY hunting needs. yours may be different.