I have no idea what to really label this as, but if anyone used an itzbeen,

http://www.amazon.com/Itzbeen-Baby-Care-Timer-Blue/dp/B000MEB3GE/ref=sr_1_1?ie=UTF8&qid=1342185164&sr=8-1&keywords=itzbeen

or i saw this yesterday--aden + anais serenity star
http://www.adenandanais.com/shop/serenitystar.aspx

or one of these http://styleberryblog.com/buy-the-stylebabylog

was it worth it? i worked in a nursery in college in the 6-12m room and we recorded all feedings/diaper changes, etc. I think as a parent it would be nice to have, but I wonder if any of these are worth getting and why.