I think I'm the ARC notebook user that Jerry mentioned!
I also prefer double sided music and a double sided blocking page. I'll remove them if they're empty or for fast sections before I call the show for the first time. (I leave them in for tech in case staging needs to be clarified for spacing or a designer.)
As an ASM, I will use a full page GP to note chorus placement, and otherwise I use post it tape in my book for notes.
Hi TarytheA,
I professionally live 100% in the opera world so I'll give my 2 cents here. As both a PSM and ASM I double side 3-hole punch all my scores. I like the flexibility and ability to add or remove pages that you don't get with the spiral binding.
When I'm a PSM I'll double side my blocking pages and just insert them into the score and deal with the blocking page being on whatever side of the binder it ends up on. By the time calling comes, I'm not looking at the blocking much anyways and sometimes remove those pages for fast sections. If you have the pleasure of working with an AD, maintaining the artistic integrity is their task, so missing some blocking isn't the end of the world.
As an ASM, no slip page. Blocking isn't their domain, and with all the traveling you have to do as an ASM, less weight is better.
I've also seen an ARC notebook used which looks to provide a happy medium with being able to add pages but having the portability of comb binding. Haven't looked into this with any depth though.
That's what I got, happy to answer any more quesitions.