Vinny is on the mark! Some tubs offer them, some don't! It is a matter of personal preference, or it was in my case when I was shopping!!
Sundance and LA Spas had it, Hot Springs didn't! It wasn't a major consideration for me! Nice to have, but I don't miss it (since I bought the HS)! It is kind of like a lounge, or no lounge, it is based on what YOU want!!!
Try at least one tub that has one and one tub that doesn't! See what you think!
Good luck!!!