I have been using Hobonichi Cousin (A5 size) for about a year, and had this Van Der Spek Red Janet Leather Codex Hobonichi Cousin Cover for about 9 months.
It is in heavy daily use so you can see signs of wear on it now – more from pen marks, cat scratches and scuffs than wear of the leather.
It is not as heavy as the equivalent Filofax would be because the Tomoe River paper in the Hobonichi is very thin and light. I believe that Da Vinci refills are made of the same paper, if you are looking for an equivalent for ring binders.
The thing that has helped me the most about the Hobonichi Cousin is the daily list pages. They really help me to list things that need to be done.
I do find, however, now I have used one book for half a year, that I wish I could throw the completed lists out, as I used to with a Filofax. I have to carry completed lists around with me all the time, there is no point in keeping them and they take up unnecessary space in my bag.
I will be travelling to Africa for more than three weeks soon and will be downsizing to a ring binder for that.