I have a "retired" set which is literally falling apart. I used that set to teach from 1980 to 2000. It is tattered, and has very little, if anything, marked or added to it. I keep that set in my desk drawer at work.
Then I have a new set which has become my every-day set. I take it to Church with me.
None of these sets have thumb-indexing on the pages. I HATE that stuff. It distracts me when I use the scriptures. Both of the first two sets were "Type A" sets which Deseret Book used to publish without thumb-indexing. You can't get a "Type A" set like that anymore. I tried. Even talked with the management at Deseret Book. Can't be done.
So I bought a "Type B" set, which is the same paper as a "Type A" but just not genuine leather bound. Much cheaper set. Then I took that set to Schafer Bindery in Salt Lake and had them bind it with a real leather cover. So I have a "Type A" set, without thumb indexing, and it only cost in total about $20 more than if Deseret Book made a proper set and sold them.