CAsio was the first digital diary for me with 8 MB RAM but soon I graduated to 64 followed by 126 MB and now the 256 MB one. Very fond of CASIO for its sheer innovation, this product is also comes into the same category as others. Great to use and store. It stores every thing I would like to have while I am travelling. It literally is a small computer in my hand and performs many a function without giving problem. I am glad I kept my trust with CASIO going because never ever it has given my problem. The features are basically an enhancement of features available in the other digital diaries but the finish on the system make it very very user friendly