I cook on a 24x40 party Gator. It is a great pit.
Here's my two cents...
I do not have the upright and don't ever feel like I miss it.
It should come with removable upper shelves in the main.
Just on the main grate I can fit six big butts so feeding a large crew is easy.
I got the expanded metal front shelf that drops down. I like being able to drop the shelf out of the way especially with my kids running around.
I also had him put threaded probe holes on either side which to me is a must. I wouldn't want to close that door on a probe wire...
I also went with a 2" drain. It is nice for cleaning. His ash rake is also nice for scraping the grease down the hole.
I like the removable tuning plates. Klose, I've heard, welds his in place but Ritch does his removable. It is easy to tune to get roughly even temps left to right just don't go crazy trying to make it perfect.
Lastly I got the round fire box with the flat top. I don't use the flat top much but I do use the fact I can open the top of the fire box and put grates in and cook in there. Reverse sear is a breeze.
My only regret was I didn't do an insulated fire box. That would have been awesome I think. Other than that I would get the same pit again.