I've carried one of these in my back-right pocket every day for the last 2 years, and each is carried for approximately 6-9 months.  I tried cheaper brands, but they didn't hold up to daily carry.  The Moleskine's work brilliantly for me.  The front pages get emergency-type information (phone numbers, auto information, passwords in code) and other things I want to have with me for extended lengths of time (inspiring thoughts, etc.), and the back perforated pages get temporary stuff (grocery lists, to do's, Amazon must haves, etc.).  After a month or two the cover shows noticeable wear, but I have never had any covers come off or pages come out without me ripping them.  The only thing that I am slightly disappointed with is that the back-inside pocket doesn't stay attached when anything is placed inside.