Sway bar or no sway bar, that is the question

I just brought my 2018 XP4 Turbo Fox home from Shock Therapy last night and tonight after work I will take it for my first spin. I have them do the re-valving and the spring kit and they suggest to me that I have the sway bar kit installed also. After spending over $1600 to have what I had done I really didn't want to spend anymore. So the big question, is it something I should buy or am I going to be OK with out it. I do a lot of riding in the dunes and the desert. Also, do I need to buy the whole kit or can I just buy the solid sway bar?
Can't wait to get home tonight and ride.