I bought several of these Bella Bands when I started outgrowing my normal (pre-maternity) clothes.  I liked that I could still wear my favorite jeans a few months longer, but I must say that it wasn't very comfortable.  And, at work (I have an office job), I get up and down from my desk all day and each time I stood up I needed to pull down the Bella Band because it would ride up when I was sitting.  This makes for a slightly embarrassing moment at the office if anyone is watching me pull it down.

I've heard from other women talk about another product that you can buy where a panel zips in to your pants/jeans and buttons like your normal pants (but haven't found them myself).  They say it's much more comfortable and I would have to guess that you don't have the problem of the panel needing to be adjusted every time you stand up.