I know our DS math isn't simple so I wondered about the usefulness of one of these. Anyone have one? Like it? Thanks in advance. 

 I have never heard of it so I went to the App store on my phone, it has horrible reviews!  I use My Net Diary and really like it.  It's simple to use, has a huge food database, and with my iphone I can scan the barcode of a product and the app will automatically input all the nutritional data for me.  Some people use My Fitness Pal too.

well I am impressed if an iphone can scan a barcode! wow! I just got a Mac-Air new laptop and was impressed with that so much I was thinking of getting an iphone next when my contract is up to trade up with Verizon. I will look up Net Diary too.