Well, it has been months now and my Hobonichi Cousin planner and Van Der Spek Codex cover in red Janet Leather are still serving me extremely well.
The cover has stood up like a champ to daily handling and tumbling around in my bag. The planner and cover together are not heavy or bulky and everything I need is in one place. It is less bulky and heavy than my personal size ring binder with 30mm rings and regular paper was, even though it holds so much more. This is mainly due to the absence of rings and the lightweight Tomoe River paper, which is half the weight of Filofax paper.
It is no problem keeping my schedule in bound format, and I don’t even mind not being able to throw away my completed to do lists (which was always my reason for preferring rings) because there is so much space for longer notes, or even two separate columns of different notes (work + shopping for example) on the same page.
The two huge things which have made a difference are the lack of bulk/weight due to the thin pages, and the fact that I cannot overstuff it the way I overstuff my rings.