Allure Traffic Master- Ok over cement? to Ultra or not to Ultra?

[Nicole Carey]

Hey all. You all have convinced me that allure traffic master is the way to go for flooring. I was curious if any of you have experience with laying it on a cement floor in a basement apartment. I know we have to let it sit in the room for 5 days to adjust after buying it before installing but was wondering if it's safe to lay right against the cement floor or do you need to put in a subfloor? 

Also-- do you recommend ultra or regular? Thanks!