Sleep Positioners

Alright,  question, as we are coming down to 12 days till the due date, I am trying to make sure we have everything ready.. and the sleep positioned idea came into my mind last night and I was wide awake tossing and turning trying to figure out if I should get one or not.... for those of you who don't know what it is I am talking about it looks something like this 

they actually make lots of different styles, but I just don't know if I should or should not get one.... so I thought I could trust my trusty blogger friends, so please help me out, should I go out today and get one of these? what are the pro's con's? do you think Baby will like it? to me the pro is while they are an infant it will keep them on their back while sleeping so i won't have to worry AS MUCH as I would possibly with out one... but are they comfortable? I mean I think about me in my sleep and I like to roll around just a little..... so as you can see I need some helpful input here... please and Thank you :)