Anyone actually have 2x 700 Subs?! Worth it?!

In a couple other posts, confirmed I can connect 2x 700 subs… it’s decision day. Am I doing it or selling the second 700 sub I inherited?

Is 2x subs worth it? Rest of the system with be a 900 and rears. Who has actually done it???

Room is 17 x 17 section of an open concept floor. Entire open floor is like 100 x 17? Flows into the kitchen

Ceiling is peak 8’ in the corners and raises to 10’